i am probably doing ecstasy this weekend. i will be with a big group of people whilst rollin to say the least.
please tell me about this drug/what to prepare for, tips on improving trip ETC ETC. thx 
Ecstasy is going to leave you feeling like you just got off and are in suspended animation in that peaceful feeling after an orgasm, thats the best way I can describe it.
Basically what GR said as well as try to drink alot of Orange juice, I've heard from a few different people the Vitamins in it will bring back the trip so you can keep it for longer. I think weed does the same thing or something like it, so smoking while on it isn't necessarily a bad idea.
Also, make sure you don't take too many or mix it with other pills because thats where it gets really dangerous. 1 triple stack or 2 singles should be plenty good for a first timer.
Also also, SHUT THE FUCK UP! this is like the best advice I can give you, you're going to want to talk A L O T about any and everything on your mind and its pretty difficult to filter stuff out!
Music is really fun too, especially rap and techno/trip hop stuff. I've heard you can see colors dance around and stuff but that hasn't really happened to me. Like GR said the comedown isn't very good, you'll have a shitload of energy and you will NOT be able to sleep for quite awhile after coming down.