Well we are moving outta the house so few jobs to do. Im not sure what to do with these....
You could get some spackle and a putty knife and try to fill and sand it that way.. or some joint compound and a trowel (watch some youtube videos on how) and sand it and paint it.
If they are just dents, fill them with dryall compound and sand. Depending on the depth you may require 2 coats. If you're in a hurry use a quick dry compound like Durabond 90.
As already stated, plaster is the way to go, just make sure you score the inside of the dent with a knife. This will allow the compound to stick better.
