I advise to start drawing cars with simple boxy shapes line a Nissan Skyline for a start. As you go further you can draw curvier cars like a toyota supra or a lexus gs.
Stuner.net is a perfect site for you to build a car from ground up and see the shape and everything, sadly the sites flash media doesnt work anymore so you gotta download it offline. And drawing wheels are kinda hard too, you just gotta learn to be really, really good at drawing cylinders.
