Female relationship advice please!!!!!?

I'm 15 and dated this girl last year and we broke up. i'm sure she likes me right now and i like her, but i would really like do date her for a more serious relationship later. should i ask her out now, or get closer to her and wait a year or two? any other suggestions?Female relationship advice please!!!!!?
I don't' understand one thing: you seem to suggest that dating her now would interfere with getting closer to her. If that's so, then I think there's something seriously wrong with the dating model. If you want something serious, practice as much as you can. Relate on as many levels as you can. In short, tell her that you're interested in as close and as long-term a relationsip as the two of you can grow. Then work on it.