Personally, I prefer to start with a harness when training a puppy/dog. It seems to be more comfortable and less intimidating to them than being pulled by the neck with a collar. Once a dog understands what it means to walk on a leash, they will be more comfortable with that leash being attached to the collar vs. the harness. Never let your puppy bite the leash or tug on it like a toy. Correct this behavior quickly by saying no and taking the leash out of their mouth and distracting with a chew toy. Let your puppy become comfortable in their harness/collar before immediately trying to go for a walk. The commands "watch me" and "heel" will be your best friends when it comes to going for walks. "Watch me" can be utilized as a great distraction technique for when walking next to a road and cars are driving by and when other people and dogs are nearby or passing. Do not let your puppy/dog run up to or jump on another person or dog without their permission as this may cause an unwanted situation in which your puppy/dog could get hurt or bitten. Don't let other people or dogs come up to your puppy/dog or pet them without your permission either. This should be mutual for safety. Teach and reward your puppy/dog to walk beside you at your pace as this will prevent pulling. When you stop walking, say heel, and have your dog stop walking as well. They should start walking when you start and stop when you stop. I like to teach my dogs to immediately sit beside me when I stop walking and not stop late or in front of me. You and your dog should be in sync. Your puppy may get curious and lunge or start pulling the leash. Quickly correct this behavior with a tug on the leash and say "heel" and reward for listening. If your puppy lunges towards a car or another dog/person, say "AHHT" very loudly so that they know this is very bad behavior. Save being loud for when it really matters. A long lead such as a 20 or 30 foot leash may come in handy for teaching your puppy to come when called as well. If you are having trouble with getting your puppy to come when called, use this long lead and call them one time. If they don't come, gently pull them towards you and when they come all the way to you, reward with a treat, affection, or their favorite toy. Starting with a short lead and increasing the distance will progressively help training.