Contact the financial aid office at USC. Ask what you will need to do to qualify as an independent student before you start. Perhaps it will mean filing some sort of amended form after you get married. I got married while in college over 20 years ago. We worked with our financial aid director of my college (she was fantastic) to figure it out. We got married a week or so before fall classes started partway though our programs and qualified as independent students, which vastly increased our aid. It was so long ago that I don’t remember much else (and probably some things have changed since then) but your financial aid officer should be able to help you out.