Whether or not you’ll qualify for need-based aid is pretty much outside of your control. There are many factors, like your parents' income, competition, diversity policies of the college, etc.
You should however definitely file a FAFSA form. Worst case, you will get an 'unsubsidized loan', which means your loan is not interest free during your time in college, but at least you have something.
You have much more control over getting private scholarships and merit-based aid offered by colleges themselves. The real power lies in how you perform on standardized tests and, of course, your GPA. But just how valuable is your GPA and test scores when it comes to winning scholarships?
Never stop planning.
Planning for the future starts the day you step on your high school campus. Which classes should I take? Which skills do I need to improve to be successful in school? Should I start writing/updating my resume? When do I take the PSAT/SAT/ACT/SATII/AP etc? There are steps we can take every month of our high school career to position ourselves to meet our highest goals after high school.