If your dog went without training for 8 months she certainly needs some intensive work. Find a good trainer or class to give you the basics. Use a Halti (or Gentle Leader) for walks. It goes over the nose and under the chin like a horse's harness. It doesn't hurt them (although most dogs don't like it...mine always tries to rub it off against my leg) and really prevents pulling. The jumping is also discouraged by a knee to their chest if your dog is lunging at you as well as reinforcing sitting and appropriate greeting. Mouthing objects is a puppy thing but teeth should never come in contact to your skin. Nipping and biting is a big no-no. You have some bad habits to undo so you will have to be pretty strict and very consistent. If you can't afford a private trainer check Petsmart for their classes.