Hi. Agree with all the previous advice. The only thing to bare in mind, is when you tell a dog no, quite often they need to do something else - this does not include a toy/bone/treat.

My dogs have a bed in the lounge. They used to misbehave when the door bell rang. They would bark and run around very excitedly. In the end we got these beds in the lounge At the same time I had to stop letting them on the sofa as they were being too dominent. Anyway, we practiced ringing and ringing the door bell and everytime making them go to their beds. Now days, they bark but on command go straight to their beds, it's worked a treat!

I think it is attention/dominence. Start by now allowing him on the sofa, if you are allowing it. When he bites your fingers, do not have a conversation with him. Tell him no and put him on his bed, if he gets up from his bed, put him back in it. He will soon learn that he is not getting any attention and there is a concequence.

Good luck
Vicky x