Just be consistent with the chewing thing. When he's chewing something he isn't supposed to, say "ah ah" and remove it from him or him from it and put something he is allowed to chew on in his mouth. Then say "good boy" in a very praising way. He's going to be chewing for a while because he's teething so just stay on top of it and be consistent..he'll get it.
Congrats on getting him home! He is adorable!!! By the way...I actually like that name - Scarf. You should think about it. (I like Bentley too..just sayin hehe)