What do I say to become friends with a girl? (girls help!)?

I'm kinda shy and I have some classes with girls that I want to be friends with. How do I start talking to them, what do I say and how to keep the conversation?What do I say to become friends with a girl? (girls help!)?
';hi,can i set beside u?';

';can i ask u something about this lesson?';

or u can be straight and say:';would you like to go out with me someday?';

GOOD LUCKWhat do I say to become friends with a girl? (girls help!)?
talk about class 'so, did you get problem 3? I dont get it.' What you doing after school are you going to the dance / party / game?