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They make some open-mesh sanding fabric you can use to block-sand the walls. It'll be slow going by hand though. You're going to have to patch and spackle too. I've used plaster of Paris too. You can fix a lot of evils with that stuff, but it will shrink. Multiple coats are required to build up corners, etc.
It may be pretty difficult to get a really smooth surface, depending on the quality of the remaining wallboard. Badly damaged sections might have to be replaced. Several coats of paint will probably be needed to get it to flatten out, & you might do some sanding between coats.
This is why a lot of painters want to put some texture on walls like this. It saves a ton of prep work.
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