So basically, I'm friends with this girl 2 years younger than me (I am a senior). Lately I have developed feelings for her but unfortunately I have no idea how to get closer to her.

First off I'd like to mention that she might already sense that I like her, but I do not know what her opinion is on it...

There is a dance coming up (Nov. 5) and I am going to ask her on Oct. 14 (or earlier if I want to avoid risking other people asking), but before that I want to get closer and hopefully in a way in which she can develop feelings for me too. To do that I know I have to get her thinking about me, what how? How do I move in and hint that I like her without being creepy/desperate/weird and obvious? We don't exactly talk everyday but she talks to me on AIM (but she is busy with HW and chores usually) and afterschool if I visit her at tennis practice.