Can you drive a motorcycle in New Jersey with a New Jersey automobile license?
No, you need a motorcycle license
Do you need your own motorcycle to get the license or will they provide you with one if not then can you drive off after buying it without a license from the dealer?
You do not have to own a motorcycle in order to get a motorcycle license. Some states do have motorcycle training programs where they will provide a motorcycle for you to learn on and get a license. Most states have a learners permit where you can ride while you are learning. You would be able to drive a motorcycle from a dealership if you had a permit.
Yes you do, however there is one exception. Chapter 11 page 166 on the NJ motorcycle Manual states: According to New Jersey law, a motorcycle can be a motor bike, a bicycle with a motor attached or any motor-operated vehicle of the bicycle or tricycle type, except for a motorized bicycle. The motor power can be part of the vehicle or attached. The vehicle must have a saddle or seat for the driver to sit…