6. I dont think that you would need I-797 for your wife. I-797 is something that is issued when in US. From Nepal, I think it would be entirely interview. Please correct if I am wrong. But yes, you have to send copy of your I-797 (H1B approval document)

7. Copy of Paystub 2-3 months

8. W-2s or Tax return

9. Letter from Employer stating your position, salary, date of employment.

10. Your letter to Consular as well as support letter.

11. Affidavit of Support I-134.

12. Copies of your passports, visas, I-20s chronically which shows you are in status since you entered US.