I have a nearly 9 week old pup (BC X, not BC) who has been here for... longer than she should have been (ie: Longer than a week). Thus far she knows how to follow a food lure, people are good, life is food, and her crate is a happy place. She also recalls to happy puppy noises and gets a treat (she's a fan of yogurt - experiment to find what your guy likes). This is all she knows. She is also by far the sharkiest creature I have ever seen in my life (and I raised FOUR young GSD pups over the course of this year, a few months per pup)- but has learned well via me replacing my skin with a toy when she goes for hands to play, and that she lands in a crate for some down time if she persists on attaching to me. *I* have learned that her getting frantically bitey means she has to poop.
Seriously, though? Your guy's a puppy. You can't train a baby dog to be an adult dog. He's going to be bitey, he's going to get overwhelmed and overstimulated, he's going to get distracted, he's going to have the attention span of a gnat. The best thing you can do for him at this age is be consistent in prevention of behaviors you don't enjoy and let him learn about the world - while you learn about what makes him tick, what motives him, what he loves and what worries him. Let him grow up some The rest will come..