First thing to do is maybe an internet search. Narrow the search down for college students like you. Never pay for any scholarship search. There is no need. A lot of unscrupulous people take money and do nothing. There really is nothing that a paid college scholarship search can do for you that you cannot do free. In fact, here is a free college scholarship search.
You can find scholarships for students who have a hobby or passion for something. Also, local businesses give out lots of scholarships to local kids each year. Your high school counselor is another good place to start. They will have info and probably even forms to fill out to apply.
There are a lot of small scholarships available, but don't sell yourself short. There are many huge scholarships. KFC gave out a $20,000 one recently.
You want your application to stand out above the others. That means making it unique. You may want to read it out loud to friends and family to see what they think. You want it to be exciting, not boring. It's not a school report or assignment.
That leads to the next scholarship tip. You cannot apply effectively to dozens. You must narrow it down to a handful and do a GREAT job applying. Or, if you are feeling well of yourself, you can apply for more. But remember that each scholarship is unique and requires a unique application and description of yourself.
Don't forget that the college you apply will have their own scholarships and grants. Don't rule out a school because it is expensive. Many of those real expensive schools give out the fattest financial aid!