Deb,
Don't be so worried!
The most important training you should be focusing on right now is potty training. That's the first step. Pick a housebreaking method and stick to it. You will be successful. As far as obedience training goes, I believe you should let them be a puppy as long as they are
a puppy! They grow up so fast, enjoy them when they are babies. Of course you should be correcting their mistakes now, like nipping or anything else you don't want them doing, but as far as structured training goes, he is a little young yet.
You should look into a puppy kindergarten class that introduces basic puppy obedience skills and allows your dog to interact with other dogs at an early age. The dog should be around 11 or 12 weeks old when joining the class. Interaction with other dogs is crucial, especially in the stronger, bullier breeds. You don't want an aggressive dog. Socialization is key. I have an Ol' Southern White American Bulldog who is extremely social, but you should start young. The puppy kindergarten class is good for you because it will show you the basic training commands you shold begin training with. You need to be confident and establish yourself as the Alpha, not the dog. They are mouthy as puppies because of teething..so make sure you supply LOTS of chew toys so he can relieve himself. When he nips, firmly say NO and immediately give a chew toy and praise him for chewing that instead of you!
Real marrow bones work wonders for chewing. Taking him in the car is a great idea to get him used to the outside world. I also strongly recommend crate training! It keeps them safe when you are not home and instills good self control into them. Knowing he is safe when you aren't around will cause less worry for you! Good Luck!!