Do you have absolutely no contact with your parents and not know where they live?
Yes, I do not know where they live and have no contact.
You can fill out the FAFSA form and then quickly get in touch with the financial aid office at the school you will be attending and they will help you.
What is the financial student aid programs based on?
The FSA is based on the idea that it is mainly your and your family's responsibility to pay for your education.
What if I left home because of an abusive relationship with my parents?
You would still have to contact your school financial aid office and explain this to them immediately after you have filled out FAFSA form.
And where do I find information on how to start the process?
Section [12] should cover that.
Is there a section specifically for parents?