Building a greenhouse. What is best kind of heat to use?

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My husband passed in June 2017 before we finished the inside of our retirement home we had started building together and he had started a greenhouse for me also. There is a 8'x12'concrete pad and 6 --4x4 posts set. They are starting to twist. We were planning on using clear and smoked fiberglass with wood section around the bottom of the greenhouse. I don't know how to get started and what would be the best way to build it and the best and cheapest heat to use in it. Thanks. Brenda
q building a greenhouse what is best kind of heat to use
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