Congrats on being motivated and aware at such a young age.
I also started very young. My best advice to you would be:
-Being building credit ASAP. Whether its a credit card, small personal loan for a car, etc. You need to work on this as soon as possible because it takes years to develop a credit history. This will help you greatly in the long run. With that being said. DO NOT get into debt you do not need or can't handle. Use a credit card only for necessities and pay it off monthly. If you get a loan for a vehicle, only do it if necessary. Don't go out and buy a fancy car or things you don't need
-Get a job and save, save, save. Cash deals in the midwest come up sometimes as low as $10,000. This much could be saved even working part time after school for a few years.
-Read/Research as much as possible. Watch what houses in the neighborhood sell for and how long it takes them to sell. Learn about repairs, maintenance things, etc. Be observant and take notes. Read the forums on here about success stories and various strategies. Read books not just about real estate, but various types of business and entrepreneurship to learn the terminology and the mindset. I recommend "Rich Dad, Poor Dad" as a great entry level resource.
Good luck!