One of the first things you try and teach your new puppy is to not go potty in the house. While teaching your puppy to go potty outside it is best to have them on a leash. So although you may not start training a puppy to walk on a leash you are going to have to get your puppy used to being on a leash.
Keep in mind that a puppy is very young and although they have spurts of energy they do tend to sleep a lot. He does not have the strength or the stamina to be going on long walks.
Puppies at this very young age do not have any bad habits but they also do not know what is expected of them. To be at the end of a leash may feel very strange to them so it is going to take some time for them to get used to the leash. You do not want to be pulling or dragging them along when they are on a leash. At one time this would have been an acceptable way of training your puppy to walk on a leash, today we like to take a more gentle approach.