When you are training your dog, it is important to use the same type of inflections and purpose in everything you do with him. Ideally you will want to start out with small pieces of dog snacks when training him.
Keep a handful of small snack pieces in your coat or pants pocket to have access to them at all times.
Keep the dog on the left side of your body right beside your left leg and as they walk with them you can teach them to heel and walk with you by using your snacks.
Never yell at your dog but it is a good idea to keep your eyes on him and your hand movements to a minimum as you reward him for every act that you command.