There might be additional documents that you might need to submit (depending on your type of entry), but I think almost everyone has to submit the following:

1. Passport style photos of you and 2 of your spouse

2. Filing fees of $420 and $1070

3. Copy of your birth certificate and your spouse's birth certificate

4. Your current passport biographical page and all pages of your old passport including the U.S. visa page, entry stamp page and I-94 card (you may or may not have this, depending on your type of entry).

5. Copy of your EAD card

6. Copy of your marriage certificate

7. Copy of all divorce decrees (If divorced from any marriages)

8. Copy of your and your spouse's 2015 tax returns, W-2, and 3 recent paystubs

9. Sealed medical exam

Pictures would help also. We submitted around 50 photos to the attorney, but I think he might have only sent around 10 with the application (you will take pictures to the interview anyway)

Other can correct me if I am missing something.