Question says all in itself. The walls are normal plaster, and there is horrid Wall paper attached to the outsides that was hidden under wooden panneling that we removed.
Thanks ahead 
Score the wallpaper first, with a gadget available at the Wallpaper store. Then either use a steamer which you can rent, or use a bottle of liquid wallpaper stripper.
Using wallpaper stripper: Use a sponge or cloth to apply the stripper to the wallpaper and leave it on for the amount of time indicated on the bottle. Then use a wallpaper scraper to scrape it off. Use a wet towel to wipe off the remaining adhesive. This is the method I prefer but some prefer the steamer.
Using a steamer: Follow the directions that come with the steamer.
November 22nd, 2011 at 3:11 am
The best way is to score the wallpaper with a "Paper Tiger" (check your home & garden store, or paint store for one), then use steam. Either a rented wallpaper steamer, or if you don’t mind waiting a bit, one of those steamers for treating colds ("Vicks" used to sell them). Eventually you’ll get all the paste or glue to steam off, and the paper will come off as well, leaving a paintable surface behind.
References :
Home renovator
School of Hard Knocks
November 22nd, 2011 at 3:38 am
If it is shinny wall paper you need to rough it up with some sand paper then use good hot water and rub over it, it will soften and you then can peel it off. You may have to do this over and over in order to get it to soften. Don’t over wet it, or it will sock into the plaster.
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November 22nd, 2011 at 4:01 am
We used a clothing iron with the steam setting. One made for wallpaper would have been nice, or else one of those inexpensive travel clothing steamers, but the iron worked. In short, the best way to get the stuff off is STEAM. Just don’t saturate. Steam and peel small areas at a time–don’t try steaming the whole wall and going back to peel.
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November 22nd, 2011 at 4:50 am
Perforate the paper …Spray sections at a time with a mixture of fabric softener and WARM water. then steam it off. If it’s stuck on really tightly you can paint over it.. Spackle and seams or holes and just paint!
References :
November 22nd, 2011 at 5:33 am
Score the wallpaper first, with a gadget available at the Wallpaper store. Then either use a steamer which you can rent, or use a bottle of liquid wallpaper stripper.
Using wallpaper stripper: Use a sponge or cloth to apply the stripper to the wallpaper and leave it on for the amount of time indicated on the bottle. Then use a wallpaper scraper to scrape it off. Use a wet towel to wipe off the remaining adhesive. This is the method I prefer but some prefer the steamer.
Using a steamer: Follow the directions that come with the steamer.
References :