If you and your friends are playing properly, then you should take it in turns to be the dealer. The strongest seats to be in are to the right of the dealer (i.e. furthest from him and therefore last to bet with the exception of the dealer himself) and getting progressively weaker as you get nearer to him. If you're closest to the dealer, only bother playing really good hands and the further you are away, the more risks you can take.
If you're new to it, don't ever bother bluffing. Chances you'll screw it up or come of considerably worse for wear.
If you're playing hold em, fold if your initial two hands are anything worse than a mid to high pair or anything other than a combination of 9 to ace. Once the flop is down, if your holding nothing, fold. Chances are you won't be making tons of cash using these tactics but you should be losing a lot less than everyone else.
If you were older, I'd suggest moderating your consumption of alcohol whilst trying to get everyone else totally smashed- that's when you move in for the kill.
I could give you a few hints on how to 'stack the odds in your favour' but I really can't condone cheating and there is always a possibility that I might end up playing cards with you in the future and I wouldn't want to give any of my 'tactics' away.
