Keep him on a leash. Play with him and the moment he tries to bite leave him and then come back after 2 minutes or so. Just get out of the scene for that time. Go back to him and start playing again. Do this regularly. Keep playing with him if he doesn't bite. Lesson-The message you are conveying to the dog is--Biting results to a negative outcome which is- stopping the play and your leaving the premises. He will eventually understand this. You need to be very patient and continue.
He'll NOT FOLLOW YOU BECOZ IN THIS CASE HE'S TIED ON A LEASH!!
You can buy him a kong toy. It's an excellent behaviour therapy for dogs. Check the website-http://www.kongcompany .com/products.
Do you use treats in training? I'm sure no. Puppies have to be motivated to do good things which latter turn into a habbit. Encourage him to follow your command and if he does follow it reward him. You can also use clicker in training. Check youtube videos to know how to use it.