Have fun with Rusk County Zoning! On my land I built a miniature version of what you are talking about - I built a 30x40 stick built building with an additional 10' porch on the long side. I have a garage on one half and a cabin on the other. As mentioned earlier, having a vapor barrier and foam insulation under the slab makes a big difference. It costs more, but I'm very glad we did that. I've never had any moisture issues and the insulation keeps the cabin cool in the summer and warm in the winter. On your living quarters side, put in big windows if you can since it makes a difference. If you can have windows on your south side, that will really help let in some heat in the winter too. I couldn't do that, but I wish I did. We added an overhang for a porch and that is really nice. Before they poured the concrete slab, we had the electrician and plumber run wires in pipes before the concrete was poured so there weren't any holes in walls or floors because of plumbing or electrical. We also added a cable line under the slab like that so we could hook up a cheap antenna so we can watch TV up there too.
We have a regular forced air LP furnace for heat. We bought a 250 gallon LP tank, but in hindsight I would have went with a 500 gallon tank. Good luck and take lots of pictures along the way.