Hello from Illinois!
"No!"
"No bite!"
"Leave it!"
Get used to saying at least these three phrases for a long time!

LOL Just like a human baby they are going to want to taste everything. And I mean
everything! They have to learn what to leave alone or you are going to have someone who is eating everything, including things that could seriously injure him. Even the blanket that you have him in, if he starts tearing at that and eating the pieces. Watching him like a hawk is going to be your daily job.

You'd be surprised how quickly they can swallow something. Especially when they think you're going to take it away! He will learn quickly if you are consistent and simple in your commands.
We got our Annie this past Mother's Day at 9 weeks old. She is our 4th Doberman but our first
puppy Doberman in many, many years! Even though she is still trying to pick up things outside that she shouldn't, I'd say the first two weeks were the worst. Just like a baby, everything was new and she wanted to touch
everything! And then eat it of course.

so just watch his every move and praise heavily when he does something right. Let him also know that biting is not an option. If you do a search on our board you will find lots of hints on how to deal with that. I'll never forget the time Annie first put her mouth on my hand and I was very surprised that she didn't clamp down! She just was kind of mouthing and not really biting. That's not to say she hasn't tried a couple of times since or that her sharp baby teeth didn't accidentally cut and draw blood, but she was pretty good about not actually biting. And she knows what, no bite, means.
Get him a few toys that are safe for a puppy and if anything looks like he's chewing it up into pieces take it away. I swear by the bully stick as a pacifier! Annie loves them and it's the only chew stick that I trust.
Good luck!! Is this your first puppy or first doberman?