It might be a very long process to get his papers at this point. Especially if his litter was never registered. Also, testing is only after 2 years old. Getting an evaluation isn't bad, but it doesn't mean much. You can find a big problem with an evaluation at an early age, but you're not going to find a moderate issue. Again, OFA won't give you an official grade until the dog is 24 months old, but they will do a preliminary which won't mean much to potential puppy owners.
It's really weird that you had 2 females lined up to stud to your dog that early. I'm not going to say that he's not a great dog, but he's really too young to know anything about him. He probably is almost filled out but not quite, and he's not titled in anything as of yet.
This isn't anything against you, but mostly against the potential bitch owners. If I was ever asked to stud my dog by someone that I really respected in the breeding community I wouldn't think twice about it (they know what they're doing), but if its just anyone, I wouldn't do it. Sorry to be blunt but it doesn't sound like they care that much about the breeding pair. There are a lot of males out there that are probably much more breed worthy than your dog (and your dog is probably more breed worthy than mine, so don't take offense to that), so just from what you've described I wouldn't trust any of those owners, to me it sounds like they wan't money (I know you don't) and want to tell their buyers that the sire is a trained drug dog.