Main areas is a good idea. My dogs are 2 1/2 and 4 1/2 (approximately) and they still are not allowed in bedrooms. There's just no reason for them to be in there, for us.
Definitely need to make sure everyone knows the rules. Jumping may be cute now, but it won't be cute in a few short months. Start the boundaries immediately. It's hard, but important to remember that while little, they are still Dobermans and still need clear rules and boundaries. Start training immediately. You don't regret starting early, you will regret waiting ... They grow faster than we like.
The guys - without knowing their personalities - make sure they understand that riygh housing with each other or the dig is not allowed. Dobermans ARE protection dogs and even the best tempered can get riled up with rough housing. For example - if hubs jokingly smacks my ass, Kaizer will grab his hand. If hubs gets rough housing with the kids - kaizer will step in the middle and put an end to it by barking. Hubs wrestles with kaizer, I do not. And definitely not when he was a pup. But hubs *knows* that if he gets bit, it's his own damn fault. But again - this wasn't started until he had some solid obedience because it could be dangerous otherwise. They're not labs (and I say that as a lab owner lol).
Commands to start training immediately - sit, down, some sort of drop it (you'll find many of us use "out" as a drop it command), leave it, stay and recall. Stress these. Every single day. Even when he seems to know them, practice practice practice.
And enjoy him

hell drive you CRAZY. It's normal. He'll act like a possessed demon shark. It's normal. He'll cuddle and be adorable. Also normal!
Exercise - limit jumping and high impact stuff for the first year or so. I'll see if I can find the puppy exercise guide again - it's especially important with larger dogs to follow. No forced running or jogging. No sharp turns. No jumping off furniture.