I recommend getting a Class III, for Exhibition or Public Sale License if you plan on selling ball pythons. If your son is 16 or older he can fill out the forms and pay the $50 annual fee himself. I'll include some links for you.

http://myfwc.com/license/captive-wildlife/applications/

http://myfwc.com/media/290311/Permits_Class3ExhApp.pdf

http://myfwc.com/media/290320/Permits_DisasterPlan.pdf

http://myfwc.com/media/2475933/Disas...ontactInfo.pdf