Bair is your best friend when edgeguarding with Wolf. But first you need to train yourself in the ways of his recovery. Go into training and practice hitting a dummy off the edge, edgeguarding it, and then returning. This will not train you to edgeguard a human opponent, because they can be much smarter about their recovery than the training dummy, but the important practice you do get from it will be learning to return to the stage from a variety of angles. I also suggest that you practice aiming Up B A LOT. Get used to how to angle it inbetween just the easy straight up or 45 degree positions. A correctly angled version of the move can often save you where a straight up or a 45 degree will kill you.