Continuing to slap your dog in the face will be setting yourself up for a big problem in the future. I completely agree with Carol's post on this.
To me, a lot of the behavior sounds like normal puppy stuff.

Having lived with a dominant male one time was enough for me, and with that experience in mind, I started training my new puppy differently even though he is not a dominant dog to begin with. I like to try to avoid problems. I never play tug of war with him, and he is taught "give" so I can easily take anything out of his mouth. He is not allowed on the furniture, nor my bed. If he forgets ( he is still a work in progress...he is a puppy, after all) he is taught to "OFF", and move his butt off the furniture immediately.I do not allow him to stand over me when I am lying on he floor. On leash, he must wait to go out the door after me. These are just some of the things I do to keep his place "in the pack" firmly in his mind.
It will take considerable re-training if a dog that has dominant tendencies is allowed to rule the roost. You don't want to be physically removing a truly dominant dog from his throne on the furniture. Start teaching him "off" NOW, by positve methods.

Ed has terrific articles on this site, on dealing with dominant dogs. I think dominant dogs are a pain in the butt, but they can also be a very bright dog to work with if they learn early, what is expected of them. If you don't like the behavior now, it will be a whole lot worse and harder to change when he is older.

In my humble opinion...
If you wish to teach bite work, protection, guard work, etc...you need to find someone to help you who knows what they are doing...not for the inexperienced!