If the puppy does something wrong, correct him with a sharp tone of voice. When he stops, praise him. Do not use rolled newspaper and do not stick his nose in his mistake.
Puppies are always anxious to please.
They respond most quickly to praise and positive reinforcement. It is best NOT to let your dog roam. He will become a nuisance and a liability. He will tend to be less protective of you and your home. He will come home only to eat.