How do I talk to this girl?

[Kevin]

I'm 18 and she is 16. She sits in front if me in one of my classes. She has recently has been talking to me. It's just small talk like 3 times so far but I never talked to her before but she said something things to me this past week. So the other day some throw a pencil at her to give it back and I guess it was on the floor and she asked me "when did he throw this at me?" I said "no I wasn't paying attention sorry" and she laughed. Why? Wasnt trying to be funny. Today this guy was saying hi to me and she kept turning around and looking at me. When we were talking for like a minute she was looking right at my eyes the whole time.(apparently I have really pretty eyes) I don't know what to say to her or eventually text her cause she doesn't have a Facebook or twitter and I know one person that has her number. I'm scared to ask her for it plus I'm a shy guy! I asked my friend about her and she said that she is obsessed with this one guy. What do I do? HELP

[Hello]

Just try having full conversations with her until you guys talk often and then ask for her number

[CManthing]

For one don't call her unless you get her number from her, it just seems creepy. Also forget what your friend said, even if it is true it doesn't have to be a problem. Based off of what your saying it sounds like she could like you, but that still seems speculative.
Either way be confident, and get her to start talking about herself. I pick up girls in a different atmosphere (usually the bar) but this works like a charm.
Girls like guys with confidence and they like to talk about themselves so they like guys that can listen to them, or at least pretend to. A good way to get her to start talking about herself is to ask her open ended questions, and to seem interested in what she has to say. (Example: Any fun plans for the weekend?) Once she answers one open ended question it opens the door for more open ended questions, and you have a good conversation going. Once you have her talking be able to remember what she said in the beginning of the conversation so that way you can reference it later. This shows that you were listening, remember girls like to talk about themselves so they like it when a guy can listen or pretend to listen.