I built a similar garage in 2002 - even did the same type of trusses. Mine was 27 x 37 IIRC
I put two huge fans in the gables to move hot air and fumes out. Did not do a ridge vent to make the fan's work better. Also no point in a ridge vent if you don't run drywall as all of the heat goes right up and out in the winter.
I also put an industrial kitchen fan in the back right corner wired up to a motion sensor light. This was my welding area, when you walked into that area the light kicked on and so did the fan. Right over my welding table.
In the other corner I had a pellet stove mounted 18 inches off the ground with a wall mount fan to blow the heat around. Worked great.
I ran a combination of industrial grade fluorescent and incandescent. These days I'd mix it with LED's
I mounted the fluorescent lights in the corners at a 45 degree angle to shine into the room.
Run shop air to the outside of the door so you can work outside with the door closed and still have air and electricity. Nice when it's hot or cold and you want to keep the main door shut.
I'd also run the foil backed sheathing - I have it in my house, keeps the temps much cooler in the summer.
http://www.buildgp.com/thermostat-radiant-barrier-osb