You're very lucky - you've got your whole life to have fun with this. Spend time getting it right and you'll have a blast. I'm sure you'll do well.
Old buggers like me didn't get to get to do this until our thirties
One other thing... if I were you I'd be looking at Linux as well. I know it's time -consuming and not easy if you don't have a spare computer lying around, but I think it's worth it. Even if you choose to stay with Windows, an understanding of other popular systems will stand you in good stead for the future.
Good luck.