If you buy a deer from someone in Oklahoma, you dont have to get paperwork, you only need the TB. Bruc and CWD health sheet if you bring deer from out of OK or if you want to prove status. That is something else you need to decide. If you plan to sell deer to other breeders, you need to buy only from CWD monitored herds that are Bruc and TB certified, this will allow you to sell out of state. If you do not plan to sell amy deer, you dont need to keep track of it, the deer then are called unmonitored and only can be sold in state and mostly just to be hunted.
You have to understand, this is a rather small industry and everyone talks. Most people will bend over backwards to make sure your happy. I would say that 90%+ of the breeders are totally honest and will work to make you happy. If you are nervous about a deal, make them put it in writing and both of you sign it, if they refuse to, then you know! Most will be willing to write up a "contract", its actually the best way, then there is none of those times where someone forgets what was said in February when the fawns are born in May.