Puppies biting is mostly a teething thing. Get him some small rawhide "bones" and chewtoys for dogs. Little cheap stuffed animals and small rubber balls work good, too. Show him you are happy when he chews on these. Dogs really want to please you!

When he bites, kind of tap him hard on the nose and say "NO!" in a loud voice. This takes a while to get comfortable doing, but they need to know when they do something that makes you unhappy. They really do not want to displease.

And chewing gets less after 6 or 8 months. At least that's what the books say!