-At first just introduce yourself. Start a little conversation about the neighborhood and school, and then you just start talking about what you want to talk about.
-Start hanging out with her.
-Compliment her. But don't make the compliment to obvious that you like her. Just say that you like her shoes, and if she blushes you're in.
-Tease her a little. Not in a mean way, but try to make her laugh.
-Girls love a funny guy. Not knock knock jokes, but just say something funny while your talking that has to do with the topic you are talking about.
-Girls like a guy who is sensitive and is always there for you. Don't be like mushy-gushy sensitive, that just embarrasses the girl.
If I think of more ways to get a girl to like you, I'll re-post this and add more. Hope this helps, it helped me!