Question #1-Ok i got my civic with a brand new coat of metallic blue paint. But who ever the hell painted the car forgot to paint the inside of the door. Plus it has a few details that need to be painted again. So how exactly would i go about getting a can of the exact type of paint?
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Question #2- I was recently re-painting all the window and frame trimming black, but i didnt notice untill today that the paint leake off of the protective newspaper i put, and onto the actual door . When and if i find a color match for my car, can i just paint over those sumdges of black paint? Or do i have to scratch it off with a blade or something, then paint the metal?

and

do i also just paint over the scrathces? Or is there some other stuff i have to apply before painting over scratches?