
Hi,
Rather than read books about "Alpha" dogs, you'd be better off reading "The Perfect Puppy" by Gwen Bailey. You'll find it far more informative and helpful. There are very few truly dominant dogs around, and the average dog owner will never come across one.
All puppies playbite when they are excited, it's automatic. Your job is to prevent the games rousing him so much - cool things down when you can see he's starting to get OTT. Don't worry, you've got a puppy that sounds 100% normal, so enjoy his puppyhood (and let him enjoy it too - it's his birthright)!
:)