Fleshing and then stretching...
You should probably get a DVD on skinning. I hope the fox is in the freezer and rolled up properly. Maybe take it to a fur buying or taxidermist and having him show you...give him a few bucks. He'll also tanning or have it tanned for you for about $25 +/-.
You'll also need a fleshing beam and fleshing knife (Necker), stretchers (wood IMO), metal push pins....the next time.
Go to F&T Fur Harvesters website to order supplies. Otter Creek Lures sells some decent wood stretchers. You can also find all the supplies needed at the next NY State Trapping Convention/Rendevous....that may be a good place to watch fur handling techniques too.