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I'm not sure the best age to start training it but ours used to get crazy excited whenever I'd enter the room so I did the "flitting game"
https://www.thecanineconsultants.co.uk/post/separation-anxiety-fact-vs-fiction
and I can't remember where I read about it but basically any time I had to leave the room like go to the loo when coming back I wouldn't give her loads of attention, just a look in the eyes and more praise once they've settled. By not making a fuss of coming and going pretty quickly they'll learn that if you leave the room you're coming back and also that they get praise if they're settled rather than jumping up.The biting, best thing I found was just always having a toy to swap out. The yelping or whatever doesn't work it just makes it a game for them. They learn by experience and they have a fun game biting your hands with noises then they'll do it again, if you rarely ever let them bite you then it won't become a habit. But it'll happen and it hurts with puppy razor teeth.
Sumo-
Yeah real good advice. I've started training, he's smart. Knowa sit, lay down, come, fetch, crate, paw already. Your right about the toys too. I have yo hold onto it. Or he just takes them all outside and come back and starts biting again. I did find the kong filled with chicken really good, loves it and keeps him distracted for ages.
skinny
that sounds brutal! I thought I had it bad, but I relent.
I just stuck a pee pad by the back door on 2nd night, but since a few nights back he's not used it and wakes me up at 7am to go toilet now.
It's more the not wanting to be alone - barking all the time - that is an adjustment. That and the biting of my hands or arms.