The video below is a great example of what you can expect from a puppy that has not been leashed trained at all. It usually only takes a week of 5 to 10 minute sessions per day before 8 week old puppies get used to walking on leash.

I would suggest using at least a 6 foot leash so your puppy has some room to make mistakes. Obviously you don't want to pull on the leash too much but you can give little corrections like a quick pull toward you if yo...