Submissive urination is a normal way for your puppy to demonstrate submissive behavior. Even a dog that is otherwise housetrained may leave dribbles and puddles of urine at your feet when greeting you. Excitement urination with a puppy is usually caused by lack of bladder control. The puppy is not aware that he is urinating; he's just excited and any punishment will only confuse him.
There are a lot of different ways to train your dog. You may choose to sign up for a dog training class, hire a professional dog trainer for private lessons, or even send your dog to board with a trainer. However, plenty of people successfully train their dogs on their own. It's a great way to save money on training costs, and a wonderful way to bond with your dog.
Many owners appear disappointed that their young puppy will not toilet when out on a walk, yet relieves itself the second it gets back home. This is because the puppy has been taught to toilet only at home (hopefully in its garden), and being creatures of habit, they often wait until they have returned home before evacuating their bladder and/ or bowels.