To get financial aid you will have to have proof of income showing you're unable to pay for student loans yourself without getting the financial aid.
You'll need your birth certificate, social security number, proof of address etc.
The place you get financial aid from or go to apply for financial aid through will let you know everything you need to bring in to apply for financial aid.
If you make too much money or your parents make too much money then you likely won't be given financial aid and will have to get loans to pay for your college courses.