Ok, so how do I get started?

I'm pretty good at girls, I usually get the girl I really want, but then she becomes my girlfriend and that's the worst part . I just wanna do all the crazy stuff ONE night. My feelings are in the way all the time, it would feel so wrong for me to just leave the girl after a fun night (you know).
I have the humor and the abiltity and "strength" to do this, to neg and all that, but It's kind of "weird" to do it, at least the first time. I know how it all works, to go in to a set and neg the girl. But yo, tell me something about the first steps into "the real world"