RE: selling hides
I am not a trapper, but I hunt and have nearly all of my life.
From what I hear, pelts are not very profitable these days. There are too many people against the fur industry. I have heard of some markets overseas doing OK.
You might try to contact a local taxidermist for information on fur trade. A friend of mine sold pelts to a taxidermist for a couple of years ending about 6 years ago. As a hobby, he loved doing it. He did say that he did not make much money after his expenses though.
As a closing note, population control for wildlife is necessary for healthy heards, flocks etc. Do not let money stop you from doing something if you enjoy it.