First of all, you don't want to wet sand bare metal. No reason too and you don't want it smooth or paint won't stick. You want to sand it with about 320 then paint it with a 2K sandable primer/filler or an epoxy primer. I prefer epoxy, then 2K then color, but most don't want to spend the money for 3 different paints. I don't do any wet sanding until after I get to color. As far as the rust goes, if you hit it with 320 it should come out. If not, you could sandblast it, or just lay the epoxy over it. It will be fine. Rustoleum makes a primer for lightly rusted metal.
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