The biggest source of scholarships is from the colleges themselves.
For each school, you need to see if a separate scholarship application is required or if there is an earlier deadline to get priority consideration for scholarships.
Your best chances at scholarships will be at colleges where your grades and test scores put you in the top 10 to 25 percent of the application pool.
Colleges also offer aid based on financial need. Every college is required to have a net price calculator on the website to help you see if you qualify for any of that type of assistance.