you have a lot to learn before you go onto any strobist stuff. my friend made a mistake when he bought his dslr. he wanted to take photos as good as me, so he went out and bought a flash with his d40. actually a damn sb800 just to out do me. didnt have a clue on how to use it. i told him how to work it and use it, but (like i told him) he needs to learn about the basics of lighting. which you do to.
dont go jumping into the deep end until you know how to swim.
at least use a smaller aperture so the lights aren't light orbs. and you can try using a flashlight and painting the car in light where its underexposed.