sectioned88
+1y
How I would go about doing would be block the dings down with 80 grit, then grind the un-scuffed lowspot with 24 or 36 or so, to bare metal, then apply filler. Block that with 80 then either re-wipe if not straight, or move straight to blocking with 180 then feather-edge that with 180 on a D.A. Then primer that.
As far as the small bare metal spots, don't even worry about it. Being that the spots are fairly small, if not then you could even use some aerosol etching primer, such as SEM, and dust a couple coats of that on there before the filler primer. -one of the many ways to do it.