My cousin just north in south ga has a steel building like you are describing and it has done well.
It has a side area with a long stainless work are with a double sink to one side for processing game or fish and a regular door entry and a roll up.
One the front there I another roll up door so he can pull in a rv or the likes to a wide open shop area.
Between the front roll up and the side roll up he boxed in the area to the front and put in tv small fridge and a bathroom.
The living area has ac the other section I think he has heat but I dont remember ac just large fans to move air.
Depending on what you are wanting to do look at some warehouse racking its adjustable for height and will hold alot at times you can find it on craigslist when places close pretty cheap
Insulation he has fiberglass with like a plastic barrier on one side, the plastic seems like it could tear. I helped me friend insulate his small shed and we used the silver back fiberglass panels that were stiff was not bad to work with and helped alot.
Here are some links about the wind depending on area
link1 link2 Door types in case you want wide but not roll up
Doors