You just ask her. [It's easy, okay. Though, the asker's probably already received that answer quite a bit... Hmm.

All right.] Make sure you go somewhere she'll enjoy, don't assume that just because you've gone out on one date that you're official or that she reciprocates your feelings, and if you really want to give her a gift you should get her something she actually likes -- if you don't think she's the kind of person to like flowers, I mean.