First, introduce yourself and talk to her as a person instead of trying to get her. if you two are getting along real good ask her out, if the first date goes good kiss her goodnight and tell her you wanna see her again. Once you've gone out with her a few times think about how you feel when with her. If the feeling is good and you sense chemistry ask her to be your girlfriend. Remember that this has no real timetable. You have to trust your male instinct and how you feel about her.