I hope this won't offend you, but I feel I need to say this. Judging from your question you don't seem to know anything about horses, and that makes you very unfit to own one.

You can't just read up or ask questions and think you can take care of a horse, you'll still have school and other things to do, and just because your parents will pay for it all doesn't mean it's ok.

Take riding classes for a few years and just learn, learn and learn. And when you known enough about horses and their needs, THEN you can consider getting one.

Best of luck to you