1. Audi A3 so you can save enough for a bike afterwards
2.McLaren F1, enzo, McLaren SLR, etc etc etc, things like this, basically just all the elite "A class" cars
3.you drive to a showroom, enter it, or you can spawn on it by using your map button (standard key = M)
then once you have found every single car showroom, you can get Bikes, or alternatively, you can try find a bargain in the second hand section at your house in game on "trade"
4. when creating an account, just under where you pick your name theres a symbol with a box next to it that says "gamespy ID" or something along those lines, click that and then enter the relavent details after that, Emial and password