We just moved into Eastern TN and have TONS of yardspace. My husband already built my greenhouse -- now he expects me to put something in it.
Rather than thinking of your greenhouse as your main focus of vegetable gardening use it to augment
your outside activities. Since you do have space outside one way you could utilize the greenhouse is to start your own transplants to be moved outside as the weather warms. Why try to grow vegetables primarily inside when you have space outside?
Another area to pursue would be using the greenhouse to extend your growing season in the spring or fall. For instance, you could plant lettuce inside earlier and grow it later than you could outside, perhaps even now if you are prepared. I say perhaps as I don't know the specifics of your climate or how warm this structure gets.
I guess what I am saying is that I would play to the strengths of the structure rather than trying to use it to replace outdoor gardening, at least as far as vegetables are concerned. Just some thoughts.