Don't be creepy.
Don't treat her like a child.
Don't act like you're old enough to be her father, even if you are (behave like a peer, not a senior).
Find common ground (Physics, philosophy, humor, medical conditions).
Appreciate her, not just her youth.
Respect her as the grown adult she is. (She had better be 18+ or you're looking at jail time, creep)
Don't poke fun when she tries to get involved in conversations with you & your buddies. It's not nice/won't get you any lovin' if you ridicule her for making mistakes about who was on the cast of "Love Boat." She wasn't around at the time or had better things to do at that age (such as learn to count to 5). Give her a break, that's part of why you like her: She's not old.
Basically the same things you'd do to get a lady of your own age. Classics work: honest modest flattery ("your hair smells lovely" vs. "that blouse is very becoming on you"), flowers (Allergies/preferences?), chivalry (not so dead, really)...
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