Once he has his permanent teeth in, go through a thorough force fetch program or take him to someone that can do it. The FF is the foundation for everything that comes in the future. Work on his obedience so that it will eventually be rock solid; "Sit" should be the first thing he is taught and is the foundation. Once he comes back with the dummy, then grab the check cord and command him to sit. Also, start teaching him the "Drop" command as you open his mouth with one hand and take the dummy out. Eventually, he will connect the word with the action and then you can progress to have him opening his mouth to release without too much "coaxing".
The check cord (8-20' cord or leash) is very important at his age so he can't get away. FF is key and a must for any good hunting or competitive dog.