WANTED: Girl advice?

So I turn fifteen years old in May and I've had a few romantic relationships before. I dated a girl off and on through middle school and then I dated a girl in October who turned out to be an emo whore. I broke it off when she said she wanted to give me a *******. I wasn't ready for that kind of intimacy, so I declined. I then pursued two different girls for a while, but one met somebody else and I got out of touch with the other. Now I like this girl at the Crossfit box my mother owns and I've known her for a little while. I really decided I liked her last Friday and I'll see her every Friday again until May. My friends say I should ask if she has a boyfriend this week, but I say otherwise. Does anybody want to give an idea of what I should do? I know both her parents, but that shouldn't be too awkward for me, maybe her though. If possible, a one sentence summary of what I should do each Friday to get her to want to go out with me, though any help is greatly appreciated! From, A Crush on Crossfit