This will require a bit of tact&finesse

1)Avoid becoming obsessed-noone like stalkers.
2)Do not hit on people continously,most especially not infront of her-she could get the feeling that u dnt like her.if u do make sure u dnt all the time.
3)Make sure u always smell gud all the time-No gal will ever want to hang around with a smelly guy.
4)Look good-She wont like it if u wear the same thing all the time.
5)Be nice to her friends-she will love u d more with that.
6)Dnt try to force anything on her-She will uncomfortable with that.
7)Dnt come on too strong at first-Be cool&casual,then u will figure it out if she wants u to come stronger.bt if she is stronger than u are,u ave the right to step it up.
8)Do not say that u can die cos of her,if she gets mad at you.This make her think u are obsessive&ave ntn better to lile 4 than her.
9)Dnt try to rush her into anytyn,u will only push her away with that
10)Dnt talk to ur fwnds abt other gals-they myt tell her thus making her ignore u.