Custom rims
 

First off, how do I remove front rims off the knuckles and rear rims off the axles? Also, if a hole for mounting the rims is too samll or doesnt have a hole, how do I make an accurate hole?

What kind of wheels are you trying to mount on the car? As far as removing the front wheels, If you don't care what happens to the origionals, take a cutter and cut them off the pin, then pull the pin out with pliers (heating the pin helps)
For the rears, I would just cut them off. I don't recommend heat because it can damage the axle gear or warp it.

I have a tutorial on mounting modifier rims to a bit. check it out and see if it helps

If you need to enlarge the holes in the front wheels, take a thick needle or a small dowel and heat it up . The best way would be a small drill bit. Take the tires off the rims and hold them with a pair of pliers. Make sure to go slow and hold the drill straight down.

modifier wheel tutorial

Thanks dude. Can you tell me what rims would be good to mount on a bit? I'm talking what brands and stuff. I got some Muscle Machines but they were too small and they were two piece.