In terms or biting this is completely normal. It is suggested that you yelp like a littermate would when he bites you but I found that just didn't work with Mylo, he seemed to want to do it even more if I yelped! So I just said a stern no. You can then direct him to appropriate behaviour by giving him a chew toy and then praise him for chewing that instead. Mylo had a bit of a thing for biting my face if we were playing so I said a stern no and stopped play for about 30 seconds. I'd avoid eye contact with him and fold my arms, then go back to playing with him. If he bit again, I would repeat until the biting stopped. This worked pretty well for me
In terms of the puppy pad Willow has a thing for ripping puppy pads. Down stairs she would only do it now and again so I say 'no' firmly and she stops to the point where she doesn't really do it any more. If I leave her in a room up stairs when we go out though she used to rip them to shreds so I used a puppy pad holder that holds them in place so she couldn't rip them.
Good luck. Hope that helps xox