I'm editing this post so it's easier to help. Ok when i look at some of the Screen shots from others, theres a blank background and everything looks so real, crome rims and all, how do i do this? The back ground is all gray or white.

Edit a picture into full resolution?

You cannot take a small picture and make it bigger.... it will have even worse quality if you make it larger. Is that what you are trying to do? Your post for help makes no sense at all :o

EDIT: Ok now some more info edited in there

I think you're thinking of Rendering. You can't edit a picture to look like this, well you can, but it takes some serious work, and lots of experience. The pictures you're most likely seeing aren't actually taken from live for speed. They use the car models from LFS, and import them into CAD software, and use that to make renders. It's a completely different skill set