Short answer: Depends.
Long answer: every girl is different. The first thing you should do, before even thinking of approaching her, is ask a million questions, get to know her. That not only shows interest, it lets you figure out what approach might work. Also, try to be sober. I know, working up the confidence to talk to a girl sometimes requires booze, but no more than a beer or two, or some wine if you want to be classy (which may not be what she's in to, btw.) Biggest mistake guys make is to be trashed the first time they meet a girl. I mean, drink with her once you know her, but try to avoid it at first.