I'm a sexual novice, can someone tell me a good way to initiate!?

I'm a guy in his twenties, and a bit of a sexual novice. I know the basics, I've had a few partners, but I'm with a girl who wants me to take charge, and ravage her. I think this sounds awesome and am ready to do it, but need some tips on how to initiate sex, I mean I don't just want to tackle her, and slow foreplay doesn't seem to fit... Please be explicit, don't assume I know! Thanks!