You can complete the FAFSA which will determine your eligibility for U.S. federally funded aid programs. Not sure I’d call that “good financial aid” especially if you are attending a private college or OOS public (which you will be)…where costs will likely exceed $50,000 a year. The only aid you are guaranteed to receive per FAFSA is a Direct Loan…$5500 as a freshman. If you are low income, you might qualify for a Pell Grant or SEOG.
Some colleges use the FAFSA financial info to determine the awarding of their institutional need based aid, but most of those don’t guarantee to meet your full need…and they don’t.