Chew toys. Monitoring the dog so that he doesn't chew on things you don't want him to. Tell him "no", gently, when he's chewing on the thing you don't want him to (and you can discourage by coating it with bitter apple) and give him something that you approve of him chewing on, and then pet him and praise him while he's chewing on the thing you approve of. Dogs are smarter than we give them credit for; with a little appropriate reinforcement, he'll figure it out. Dogs also pick up on moods sometimes better than other humans do, so you want to make sure that you pay attention to what you could be telling the dog with your body language unconsciously. (For example, thinking it's cute when he's chewing on something even though you're telling him no, or taking out a bad mood on the dog and creating a fearful or anxious puppy.)
And most of all, don't punish the dog for doing something that is instinctual, any more than you would punish a human baby that is teething. A gentle "Not that, chew this.." and then say "GOOD BOY!" in a high pitched voice with a lot of happy wiggling and petting gets the message across much better than a smack on the butt or head. Potty training, if you haven't gotten there, can be addressed the same way. And I highly recommend crate training.
Beware of rope/string toys with strong chewers; if they shred it, the strings can get looped around a bend in their digestive systems and cut them from the inside. Something like a Kong Wubba is a good unsupervised chew toy where something like a hunk of nylon or cotton rope should only be played with as a tug toy with human supervision.
Dogs chew half out of comfort (either from pain or anxiety), and half out of boredom. Providing interesting things to chew on will get you at least halfway to the dog not chewing. The other half is making sure that you and the puppy get a LOT of exercise and that the puppy has a lot of interesting play opportunities. Puppies don't have a lot of endurance, but they 'recharge' their energy really fast. We haven't had a real young puppy in a while, but it used to take two or three short walks a day.
Big note on exercise: If the puppy is a large breed (dane, mastiff, anything larger than 90 lbs as an adult) you should probably wait until they are 2 y.o. before taking them running or jogging. Otherwise, you can cause permanent damage to their joints. Wait until the growth plates in their bones are closed. For smaller breed dogs, it's OK to jog with them as soon as they're past most of their growth, but start with lower distances and work up.