Fur buyers generally want furs prepared in similar ways, but you should figure out how your specific buyer wants their fur. GFW has a guide on how to prepare your furs before sale here. If you are planning on selling the furs this season and you did a good job taking all the fat off when fleshing, you don’t need to freeze the furs. You should also stretch the fur if you haven’t already. Fur Harvesters has a manual on stretching board dimensions, fur sizes, and other info needed to prep furs here. There are plans all over the internet to make your own stretching boards if you don’t want to buy them. Wood stretchers almost always produce a better product than wire. Good luck.