I'm not 100% sure what he's asking but I'm new here and have very little electronics experience but I'm pretty sure the answers to those questions are:
1) + to - or - to + depending on which direction you want it to go? lol (I'm probably wrong here)
2) This depends on how you want to use the wheels I guess.. If you want them all to drive constantly I'm sure you could figure out a way to gear all of the wheels to move from one motor. I am also certain that it wouldn't be extremely easy (Unless the car itself is a prebuilt thing built to accept this type of single motor input). If you want them to drive separately and possibly use wheel direction to help turn and pivot then you will almost definitely need more than one motor (still could figure out a way, I'm certain, to gear this but I don't think it'd be practical at all...)
Like I said, I'm in no way an expert so I'm probably wrong but... Maybe it will help out a little...
@cr0sh, And sadly, this is the way the world is going. We have kids graduating from high school without the ability to read and parents afraid to keep score during soccer games for fear their kids will get sad when they lose. We're doomed haha