I want to file i-485 by myself, but I have a few questions below, pls extend your kind help. 1. Mail package: I will file together with my wife. I am the primary applicant. I was told by my friend the documents for each applicant should be put in a separate envelop. But the two envelops should be put into one mail package 2. Checks of filing fee: Do I need to write two separate checks or one check of total filing fee for my wife and me? The checks should be put in each applicant's envelops separately or just in the primary applicant's envelop? 3. Passport or birth certificate: My passport has expired and it will need 6 months to get it renewal. But I have valid birth certificate. Do I need to provide a copy of my expired passport or only birth certificate, or both? Does it require the original copy of birth certificate or just a photocopy? 4. Delivered by USPS or FedEx Should I deliver the package by USPS or FedEx? Thanks.