Have a look at the last page of the "Housetraining 101" thread as Kian talks about nipping and biting in there. She is the owner of two Aussies, and a dog behaviourist.
I also need to remind you that 10 weeks old is hardly the time to expect a puppy to stop chewing and nipping! That is far too soon in terms of expectation. Keep your expectations realistic, and please only use positive training methods at this age, particularly for this issue.
Imagine being aggressive with your dog to teach him not to be aggressive. We don't (or shouldn't) do that with children so why do it with a puppy.
It's all fine and well that you play with the puppy and that the puppy has his own "friends" and loads of mental stimulation and exercise. Sometimes, like a young child, a young puppy becomes overly tired and needs a time out. This is a great time for a little crate time, not as a punishment, just for a break. Use a dampened, twisted, frozen face cloth as a chew toy. When the puppy is relentless with nipping and biting, then quietly in the crate the puppy goes.
Obviously when you return home after work, the puppy needs to go outside immediately. Make no fuss except when your puppy does his business outside. Come back in and virtually ignore the pup until everything is calm. Sit down, without a fuss and then pet the puppy.
Do not let the puppy get to the level of excitement that causes the undesirable behaviour. It's only been 2 weeks, if that, which isn't long at all. By 16 weeks, your puppy should have an idea or slight inkling of what is acceptable and what is not. It takes a solid six months to even move on to the next phase of puppy training. Right now, it's all about consistency, patience and the basics.
I suggest you read through several of the threads in this section regardless of their title as you will pick up tidbits here and there. Good luck to you!
Hopefully some of our other members will be along with more concise information, but hopefully the little bit of encouragement I have given you will help for now.