How do you repair drywall that has torn from wallpaper removal?

You can buy drywall compound already mixed. If you don't have one, buy two putty knives (they're cheap) one small and one larger (for larger jobs.) If there are small holes in the drywall you can simply fill the hole with the drywall compound. You may need to give it a second application or even third application as the compound will shrink as it dries. When I apply it I am sure to make it even with the wallboard and clean up around the edges as this makes it easier to sand with a fine sand paper after. Let it dry over-night and then lightly sand with fine sand paper. For larger holes you will need to purchase a dry wall kit which includes a drywall patch to cover the area. Follow the directions in the dry wall kit which are pretty much the same as covering a smaller hole, you just need more of the drywall compound. The patch is needed to adhere the compound to the wall and to give it stability.