Never, ever hit your puppy with the lead: it shoudl be a symbol of walkies" and therefore synonymous with joy, not punishment.

Just as with house training, puppies do better if they start to learn about  walking on the lead very early on.

• First of all, get your puppy used to wearning a collar and then put the lead on him at home, just for a short time a couple of times a day .
• The next step is teaching him to walk on the lead outdoors.  First, make him sit next to you (either on your left or right side, whichever suits you best, but always stick tothe same side), the give the command to "come " and start walking.
• Keep the lead loose and move forward at your own pace: the puppy walks near you, his head level with your knees and the leash remains loose.
• When you stop, tell him to sit and reward him with petting.
• If the pupy pulls, say "NO" while giving a sharp pull on the lead at the same time.