thanks for all the quick input!
ill look into code/insurance for OSB vs plywood
atm is has a "cold roof" with soffit vents and ridge vents.
I have a buddy who is an electrician doing the work for beer. my carpentry is middle skill level (can recruit others)
ill have to look into metal more...
short story: bought first house, with a New garage built in 2008. 24x24 (height of the the Triangle supports is about 9 Ft. not home to measure atm). single door. its unfinished. Soffit Vents and Ridge Vent. junction panel with 1 20 amp and 1 15 amp circuits.
I Live in Central Illinois. Garage...