After filing form I-90, applicants will receive a receipt notice within 2-3 weeks, which includes a 10-digit receipt number for case tracking. A biometrics appointment notice will follow in 3-5 weeks, with fingerprint exemptions for those aged 75 and older, and the new green card is expected 4-5 months post-filing. It's crucial to notify USCIS of any address changes within 10 days, and American Immigration Services is a private entity that assists with form preparation, not a law firm.