dog training exercises

What is a good dog breed for me?
This is my first dog. I want a medium or large dog. Exercise for about an hour or more, but am willing to do much for the dog. I want a dog very average amount of energy. There will be other animals than dogs. The eldest son is 14 years. I would like the training is relatively easy. The dog may have a high capacity or low monitoring / protection capacity. I groom the dog for any amount. I can do against an average shed.
If you want a dog that quietly I love you with all your heart and soul, get a Doberman. Also, be prepared to give his life to protect you and protect your family. He shed all his clothes and furnishings, is clean and tidy in appearance too. His only requirement than that of the German Shepherd is that the Dobermann should be raised in the house since his hair is not enough to protect from the cold.
Dog Exercise Video- crazy dog tricks