Autozone
You'll need sandpaper, a poly body fill... just finishing stuff, and maybe some degreaser type stuff.
Then its sand up the scratches so to be nice and smooth, spread thin layers of the body filler, to fill the scratches, and sand smooth.
Then painter up, how ever you like.
Google should give plenty of how tos and great ideas.
But most importantantly, don't ever EVER do......... Oh gotta go.