I called my mother in same situation except that no 2nd FP for me.
Entire copy of passport,
copy of latest pay stub.
EAD copy
Copy of I 485 Receipt.
Copy of Last year Tax returns.
I-134 form ( Notarized ).
Affidavit of support ( A plain letter
from you to consulate requesting
for VISA).
Copy of Recent Bank statement.
Copy of most recent W2 form.
Please notarize the form I-134, attach all documents mentioned above and mail it to the person whom you want to sponsor. He/She must take all the above documents and approach the U.S. Consulate in their city of jurisdiction. they will have fillup DS-156 form , cheques for visa fees and application processing fees.
Take appoinment on ttsvisas.com
RD:Jul 2002.
ND:Jul 2002.
FP:Sep 2002.
Above is not official. Do it at your own risk.
Cross check always.