How to airbrush a scratch that's down to the metal???

[Kytanna]

I have a high end Badger airbrush and compressor. Never used it on metal and only for artwork on canvas. But I walked outside and seen that some idiot put a deep scratch in my brand new car and figured I should try to fix it before spending $$$ getting it fixed professionally.. (Figured what's the worst that can happen? I screw it up and I bring it to someone to fix preofessionally.. lol)

Anyone have a step by step process for this sort of thing?.. Any good video's on the net? (I checked YouTube and didnt come up with anything)

I assume I can just purchase touch up paint from my local dealer and throw that into my airbrush?..

Any and all help would be greatly appreciated!