Karyn, if you get all the old glue off with the water, as you should be able to do, you just need to spackle, SAND the spackled area, and apply a coat of primer/sealer, which might also be called SEALCOAT. OK???
If you haven't removed wallpaper before, here are a couple of tips. Using water with vinegar or DIF in it and a Paper Tiger in it will get most papers loose. Use a wide (3 or 4") taping knife if you can get away with it, and a regular metal putty knife if you can't, for removal of the loosened paper.
If you have a vinyl coated paper, you have to remove the vinyl coating to get to the glue. This is often done by 4 year olds if they manage to find one loose layer of the vinyl to grab. If you don't have a 4 year old handy, enjoy yourself.