Doing it, you have to bring (1) an orginal copy and translated (certified) copy of your emergency documents, (2) your old AP (if you have), (3) your receipt of I-485, (4) your approval of I-140 (if you have), (5) your passport, (6) currently filled I-131, (7) 2 photos, (8) application fee (check, money order, or cash), (9) your air tickets (if you've already purchased).
Best wishes.