It's an old cliche but if you want to get in with a girl then make sure to get good with her friends. Also be confident but not overly forward, make her laugh but don't pile it on. Give her compliments, if she likes you as well as the things you say then she'll show it. She's not going to jump you or label you a creep right off the bat. Girls are humans too guys, they get nervous and also have things they like and don't crumble or vow off/revenge on all women if she doesn't seem interested in you.
I've honestly found girls love a guy who is confidently stupid, no not stupid confident as being too sure of yourself can come across too strong for some of them, but no making the night interesting by doing something unexpected but legal is a damn fine way to get her attention, then you can work on the other things or be creepy. Your choice! :D