Wow, it's really enterprising of you to think of holding fundraisers for your college costs!
You could put up a website/blog telling about yourself, what you plan to study in college, etc. and asking for donations or sponsorships. You could sell something, like T shirts or quilted items to raise money.
You'd probably have an easier time of it if you started your own business than if you try fundraisers. The thing about most fundraisers is that they're usually for non-profit causes, and non-profit organizations can do things (like bingo nights) that laws don't allow you to do for profit. And while getting money for college is a very worthwhile cause, it's definitely profit for you.
You own business could be a part-time thing, where you sell online, at flea markets, through word of mouth, etc. You could make something or you could provide a service, like tutoring or babysitting (when you're not busy with your new niece).