Create Parameters

DECLARE @TABLE_NAME VARCHAR(50) = 'PrameterTable'
DECLARE @TableName AS         VARCHAR(200)
DECLARE @ParamNames AS        VARCHAR(8000)
SET @TableName = 'TableTest'
SELECT @ParamNames = (COALESCE(@ParamNames + CHAR(13) + CHAR(10), '') +
       CASE
              WHEN DATA_TYPE = 'bigint'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE
              WHEN DATA_TYPE = 'binary'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE + '(' + CAST(character_maximum_length AS VARCHAR) + ')'
              WHEN DATA_TYPE = 'Bit'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE
              WHEN DATA_TYPE = 'Char'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE + '(' + CAST(character_maximum_length AS VARCHAR) + ')'
              WHEN DATA_TYPE = 'Date'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE
              WHEN DATA_TYPE = 'DateTime'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE
              WHEN DATA_TYPE = 'DateTime2'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE
              WHEN DATA_TYPE = 'DateTimeOffset'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE
              WHEN DATA_TYPE = 'Decimal'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE + '(' + CAST(NUMERIC_precision AS VARCHAR) + ',' + CAST(numeric_scale AS VARCHAR) + ')'
              WHEN DATA_TYPE = 'float'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE + '(' + CAST(NUMERIC_precision AS VARCHAR) + ')'
              WHEN DATA_TYPE = 'geography'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE
              WHEN DATA_TYPE = 'geometry'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE
              WHEN DATA_TYPE = 'hierarchyid'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE
              WHEN DATA_TYPE = 'image'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE
              WHEN DATA_TYPE = 'int'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE --+ '(' + CAST(NUMERIC_precision AS VARCHAR) + ')'
              WHEN DATA_TYPE = 'money'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE --+ '(' + CAST(NUMERIC_precision AS VARCHAR) + ',' + CAST(numeric_scale AS VARCHAR) + ')'
              WHEN DATA_TYPE = 'NCHAR'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE + '(' + CAST(character_maximum_length AS VARCHAR) + ')'
              WHEN DATA_TYPE = 'numeric'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE + '(' + CAST(NUMERIC_precision AS VARCHAR) + ',' + CAST(numeric_scale AS VARCHAR) + ')'
              WHEN DATA_TYPE = 'NVARCHAR'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE + '(' + CAST(character_maximum_length AS VARCHAR) + ')'
              WHEN DATA_TYPE = 'ntext'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE --+ '(' + CAST(character_maximum_length AS VARCHAR) + ')'
              WHEN DATA_TYPE = 'REAL'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE --+ '(' + CAST(NUMERIC_precision AS VARCHAR) + ')'
              WHEN DATA_TYPE = 'smalldatetime'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE
              WHEN DATA_TYPE = 'smallint'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE --+ '(' + CAST(NUMERIC_precision AS VARCHAR) + ')'
              WHEN DATA_TYPE = 'smallmoney'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE --+ '(' + CAST(NUMERIC_precision AS VARCHAR) + ',' + CAST(numeric_scale AS VARCHAR) + ')'
              WHEN DATA_TYPE = 'sql_variant'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE
              WHEN DATA_TYPE = 'text'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE + '(' + CAST(character_maximum_length AS VARCHAR) + ')'
              WHEN DATA_TYPE = 'time'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE
              WHEN DATA_TYPE = 'timestamp'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE
              WHEN DATA_TYPE = 'tinyint'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE + '(' + CAST(NUMERIC_precision AS VARCHAR) + ')'
              WHEN DATA_TYPE = 'uniqueidentifier'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE
              WHEN DATA_TYPE = 'varbinary'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE + '(' + CAST(character_maximum_length AS VARCHAR) + ')'
              WHEN DATA_TYPE = 'varchar'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE + '(' + CAST(character_maximum_length AS VARCHAR) + ')'
              WHEN DATA_TYPE = 'xml'
              THEN '@' + COLUMN_NAME + ' ' + DATA_TYPE
       END )           + ','
FROM   INFORMATION_SCHEMA.Columns
WHERE  TABLE_NAME = @TableName

SET @ParamNames = LEFT(@ParamNames, LEN(@ParamNames)-1)
PRINT @ParamNames

Re Written Query

DECLARE @TABLE_NAME VARCHAR(50) = 'ContractMaster',
@DATA_TYPE  VARCHAR(50) = 'numeric'

SELECT paremeters       = ('@' + column_name + ' ' +
CASE
WHEN data_type   = 'BIGINT'
OR     data_type = 'Bit'
OR     data_type = 'Date'
OR     data_type = 'DateTime'
OR     data_type = 'DateTime2'
OR     data_type = 'DateTimeOffset'
OR     data_type = 'geography'
OR     data_type = 'geometry'
OR     data_type = 'hierarchyid'
OR     data_type = 'image'
OR     data_type = 'smalldatetime'
OR     data_type = 'sql_variant'
OR     data_type = 'time'
OR     data_type = 'timestamp'
OR     data_type = 'uniqueidentifier'
OR     data_type = 'xml'
THEN data_type
WHEN data_type   = 'binary'
OR     data_type = 'Char'
OR     data_type = 'NCHAR'
OR     data_type = 'NVARCHAR'
OR     data_type = 'text'
OR     data_type = 'varbinary'
OR     data_type = 'varchar'
THEN data_type + '(' + CAST(character_maximum_length AS VARCHAR) + ')'
WHEN data_type   = 'Decimal'
OR     data_type = 'money'
OR     data_type = 'numeric'
OR     data_type = 'smallmoney'
THEN data_type + '(' + CAST(numeric_precision AS VARCHAR) + ',' + CAST(numeric_scale AS VARCHAR) + ')'
WHEN data_type   = 'float'
OR     data_type = 'int'
OR     data_type = 'REAL'
OR     data_type = 'smallint'
OR     data_type = 'tinyint'
THEN data_type + '(' + CAST(numeric_precision AS VARCHAR) + ')'
ELSE data_type
END) + ' ,'
FROM   information_schema.columns
WHERE  table_name = @TABLE_NAME
AND
(
CASE
WHEN
(
@DATA_TYPE IS NULL
OR     @DATA_TYPE       = ''
)
THEN 1
END       = 1
OR     data_type = @DATA_TYPE
)

Re Written Query

DECLARE @TableName AS         VARCHAR(200)
DECLARE @TableName AS         VARCHAR(200)
DECLARE @ParamNames AS        VARCHAR(8000)
DECLARE @HorizontalTabChar AS CHAR(1)
DECLARE @NewLineChar AS       CHAR(2)
SET @TableName         = 'TableTest'
SET @HorizontalTabChar = CHAR(9)
SET @NewLineChar       = CHAR(13) + CHAR(10)
SET @ParamNames        = REPLICATE(@HorizontalTabChar, 3)
SELECT @ParamNames     = @ParamNames + '@' + syscolumns.name + ' ' + t.name + CAST( (
                     CASE
                            WHEN COLUMNPROPERTY(OBJECT_ID(@TableName), syscolumns.name, 'Scale') IS NOT NULL
                            THEN '('  + CAST(COLUMNPROPERTY(OBJECT_ID(@TableName), syscolumns.name, 'Precision') AS VARCHAR) + ',' + CAST(COLUMNPROPERTY(OBJECT_ID(@TableName), syscolumns.name, 'Scale')AS VARCHAR) + ')'
                            ELSE '('  + CAST( COLUMNPROPERTY(OBJECT_ID(@TableName), syscolumns.name, 'Precision')AS VARCHAR) +')'
                     END) AS VARCHAR) + ',' + @NewLineChar + REPLICATE(@HorizontalTabChar, 3)
FROM   sysobjects
       JOIN syscolumns
       ON     sysobjects.id = syscolumns.id
       INNER JOIN systypes t
       ON     syscolumns.xusertype = t.xusertype
WHERE  sysobjects.ID               = OBJECT_ID(@TableName)
SET @ParamNames                    = LEFT(@ParamNames, LEN(@ParamNames)-6)
PRINT @ParamNames

Another One Not Much Confident

DECLARE @TABLE_NAME VARCHAR(50) 
SET @TABLE_NAME =  'tabletest'

SELECT '@' + syscolumns.name + ' ' + UPPER(systypes.name) + ' ' +
       CASE
              WHEN syscolumns.prec    IS NULL
              AND    syscolumns.scale IS NULL
              THEN '(' + CAST(syscolumns.length AS VARCHAR) + ')'
              WHEN syscolumns.prec    = 0
              AND    syscolumns.scale = 0
              THEN '(' + CAST(syscolumns.length AS VARCHAR) + ')'
              WHEN syscolumns.prec    > 0
              AND    syscolumns.scale = 0
              THEN ''--CAST(syscolumns.length AS VARCHAR)
              WHEN syscolumns.prec          = 0
              AND    syscolumns.scale IS NULL
              THEN '(' + CAST(syscolumns.length AS VARCHAR) + ')'
              WHEN syscolumns.prec          > 0
              AND    syscolumns.scale IS NULL
              THEN '(' + CAST(syscolumns.length AS VARCHAR) + ')'
              ELSE '(' + CAST(syscolumns.prec AS   VARCHAR) + ' ,' + CAST(syscolumns.scale AS VARCHAR) + ')'
       END
FROM   sysobjects
       JOIN syscolumns
       ON     sysobjects.id = syscolumns.id
       JOIN systypes
       ON     syscolumns.xtype=systypes.xtype
WHERE  sysobjects.xtype       ='U'
AND    sysobjects.name        = @TABLE_NAME