Is she asking for advice? If not, go slow with the suggestions. Just tell her you like or don't like something when she's doing it. And maybe show her a little this or that.
Are you happy with what she does? If yes, make sure you let her know.
Buy a Kamasutra book, discuss what each of you would like to try.
That depends on what your girlfriends comfort zone is?
how far does your gf wanna go?