Call my manager at caswells, Bridger Kimbal and he will help you with this. I have had one since 1978 and I don't think they have changed much nor the stuff that you must do to become a dealer.
I am not at the range so I don't have all the info to help you but it is not as difficult as they make it sound, it just takes some time.
Call him at toll free 1-888-727-4668 www.caswells.com
He will be out of town for the long weekend beginning Fri and will return Tue if you do not reach him tomorrow.
Hope this will help you to get start.