Following documents you have to submit:-

1 - MARRIAGE CERTIFICATE - ATTESTED BY EMBASSY AND FOREIGN AFFAIRS
2 - YOUR WIFE PASSPORT COPY % YOURS
3 - SALARY LETTER FROM YOUR COMPANY
4 - BANK STATEMENT - LAST 6 MONTHS
6 - SALARY SHOULD BE MORE THAN 7,500/-
7 - HOUSE / FLAT CONTRACTS

Best of Luck