Alternatively, go to the end of the leash and kneel down facing away from your dog and wait for your dog to come to you, praising him all the way.
It does not matter how long it takes for him to start walking, (although it should not be more than a minute or two), he eventually will. Then, walk another few feet away and repeat if he stops.
If your dog is afraid of leash walking, you will need to take him out for numerous confidence building training sessions on leash. You do not want to take him with you on an errand when you may be in a hurry and get frustrated with your dog. Once you have taken the time to teach your dog to enjoy leash walking, he can come along with you on all your errands.
--Dick Colman