I have a shop same size as yours w 12 ft ceiling. I put R19 batt fiberglass in walls and blown in fiberglass in ceiling to R30. I ran electric wires up above ceiling then down posts to outlets and thru ceiling for light outlets. I think that is so much neater than conduit. I did combo of osb on some walls and 3/8" beadboard on others for more finished look. In a garage drywall gets damaged too easy.
For heat I put in hot water floor heat in concrete with electric source heater/pump system. I love that floor heat. I divided the space into 20 x 60 main shop, 10 x 60 storage/office/tool room, and 10 x 60 unheated garage. I have been real happy with the shop.
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