The sandpaper is fine and will do the job (looks t be about 150 grit). IMO, I'd buy some new ones though... (I personally have 150 grit, 220 grit, 600 grit, and 1500 grit. 150 is for getting rid of a lot of putty, 220 is to kinda do the same as 150 grit, 600 is for detailing and minor smoothing out, and 1500 is just for smoothing out)
And you get rid of the marks using, um, sandpaper. Or if you're talking about the black dots, don't worry about it. Paint will cover it.
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ಠ_ಠ I see what you did there
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