Increase the exercise by a lot. Also, behaviors that make a dog a pleasant companion (not jumping on people, taking treats gently, focusing, etc.) don't come naturally to most dogs. They need to be explicitly taught by the owner.
OP, it does sound like you are a little inexperienced. My best advice would be to find a good trainer and sign up for classes ASAP. That will help get you on the right foot, and help you set goals and reach them.
Good luck! This is a very exciting time for you.