For any hole or ding the size of a 50 cent piece or smaller, this thing is magic. It will work perfectly for the staple holes and you’ll be amazed at how fast it goes and how perfectly you can smooth the patch. It’s magic, I say.
https://www.3m.com/3M/en_US/p/d/cbgnawus2281/
We had a house that the previous occupant had apparently hung a picture from every square inch of wall space. There were so many holes it looked like someone let blast a couple of magazines of full auto rifle fire. No kidding. A half dozen tubes of the 3M stuff and you couldn’t tell there had been a dimple in the wall.
For the larger openings around the window, fill the voids with drywall patched screwed to the framing as much as possible. Then just get some mesh (not the old fashioned tape), high strength joint compound snd a good trowel. Buy a sanding block to finish it flush with the original wall, but if you smooth it out nicely before it dries you’ll hardly have to do any sanding. The nice thing is that if you make a mistake all you have to do is add a coat of mud, trowel it smoothly, and sand it back to flush as soon as it dries. There’s nothing that can go wrong that can’t be fixed.
Once you’re done with the patching you’ll hardly see where the patch was. Slap a coat of paint over the finished patch and you’ll never be able to tell. This is one repair anyone can do. I am living proof of that.