get on a good level and then nurse beers form there. no need to be a shitshow now...save that for a later time.
strike up some convos with some upper classmen, especially girls(you will be surprised how far a lil confidence will get you with girls around that age).
Take a pack of cards with you and get a few drinking games going if the party has a lull - google: kings cup, fuck the dealer, etc.
generally be a nice guy, try and at least say whattup/thanks to the host before he/she gets too drunk to remember you.
FOR THE LOVE OF GOD, DONT BE "THAT GUY". I know you think you can drink a lot, but big parties where you are trying to make a positive impression are not the place to push you limits. get drunk, but dont get trashed.
Do not let a girl drag you into her puking/crying drama. thats what HER friends are for. just alert them to the situation, act like a nice caring guy, and GTFO of there.
Walk/bike home, or pass out somewhere on the property.
***Buy some bud beforehand and roll up a doobie. then when you chat up a cutie or two ask them if they wanna go out back and smoke.
Bring more alcohol than you can drink yourself, and only offer it to the people you want to make a good impression on. you want to get invited to these things again, so spotting someone a beer is always a good plan...and they will most likely return the favor down the road.
If someone wants to stay sober, dont be a dick and give them shit the whole night. One joke, and then move on.
Dont fuck, just get the girl to give you dome.
If someone hands you a cup of beer and its a little warm, make sure its not piss before you take a swig.
Bring two boxes of Cheez-Its. Drunchies will happen, and when you bust these bad boys out, you will become the toast of the party.
Enjoy yourself, do what seems fun, but dont be above a sincere apology when/if you do something or say something stupid.
Lastly, tell your parents you are staying over at a friends house...one that they dont know.