My bathrooms has thin tongue and groove wood on some of the walls. Where there is no wood, but where there might have been before, it looks like there was something used behind it on the drywall. It makes the drywall rough. I plan to pull off most, if not all of the wood, and then paint the walls. How do I fix that rough drywall? Also, on the one wall I might leave the wood on, there is a wood board that has a large paint mark on it. How can I remove it? Also, how can I refinish that wood wall to make it nicer. The colour is fine, I just want to seal it up so that I don't have to worry about it molding or rotting. And finally.... There is a hole the size of a piece of paper in a wall. How can I fix that as well?