Hi people. I'm very grateful for this forum. Ok onto my question.

So in 2 weeks we're going to have this party out of town. Will be approx 18 people (should be 5 girls if not mistaken). Now one girl I've been chatting a long time over internet and met her like 1 year ago very briefly(15mins?). So we've been talking/flirting alot over last 2 or so months and only last couple of weeks I started to see potential in this *laugh*.
I noticed she's a commanding person and trashtalks easily (me included). But now I've started negging her alot and sometimes showing some interest in her so she's after me often now.
Now what I want to know is.. what should I be doing and not doing during that party (will last 2 days so only 1 night there). There's lots of stuff I already used up (like most of my negs I had) but that's not a big deal I'll come up with something. What's the general plan for a person you knew over the internet mostly? The thing is I got a long time girlfriend(which I appreciate alot) already and I just want to game now, prove something to myself. So with all respect to the other girl I want to make out as far as I can. Oh and after that party we're still back to the same kind of acquaintance as before I guess, we'll see. And 1 more thing haha.. there's going to be her ex at the party and I know him more than her.

So what scenarios you guys can see here?

MUCH APPRECIATED!