I like the ideas above, but since you are working with a relatively limited time frame, I'd start with "most relevant" and work out from there.
You don't have a steady job, so I think the basics of cash flow management matter most. Where do you keep your money (checking, savings, etc.)? If you don't have any of these accounts, then hie thee to a local bank and get them. Since you are presumably going to college soon, I'll skip my usual advice to pick a friendly neighborhood credit union and instead recommend that you choose a bank with national coverage so that you have a good shot of being able to do your banking both at home and school. (If you know which school you plan to attend, and can check to see which banks have nearby/on-campus branches, so much the better.)
Once you have these funds in place: How do you plan to keep the money going over the course of say, a college semester? Have you built up a budget? Will you be saving for travel and computer equipment?
Do you plan to make some purchases with a credit card? If not, do you know how to use one without getting in trouble? Not to toot my own horn, but you might want to check out this:
Also, how are you going to pay for school? Have you filled out the FAFSA, Profile, and other aid forms? Do you have scholarships? Have you applied for many? Are your parents or other family members going to contribute? What is left for you to cover, and can you contribute via work-study? If you need to apply for student loans, do you know what will be required to pay them back?
In this case, I'd make sure your parents picked up The Princeton Review's "Paying for College Without Going Broke" and O'Connell's "Free Yourself from Student Loan Debt". All of you should read them together.
Once you feel that you have a good handle on these issues, then look into questions about long-term saving (for a car, house, etc), and investing (both within retirement accounts and otherwise).
If you simply want to be pointed to a guide, given your age and situation, I'd recommend something like Suze Orman's "Money Book for the Young, Fabulous, and Broke" and Beth Kobliner's "Get a Financial Life." Neither of these are perfect, in my opinion, but they do a decent job of covering the basics.