what are the first things i need to know when choosing new rims? i know you need to know what kind of design your car will accept, and how much weight the rims will support, but i dont know anything other than that. where can i find the dimensions that fit my car and what weight it supports? if i get new larger rims, will i need to get better braking? how will i find the tires that will fit? am i going to have to special order every one? sorry for all the questions, but im just curious about these things.

The first place you need to go is www.tirerack.com and educate yourself about tires. I'm sure you can more info than you want know there & www.google.com

Depending how heavy and how big would determine if the brakes and suspension need upgrade. For performance you want as light as possible. I wouldn't recommend any thing larger than 17"