Lots of outlets!! It's cheap, cheap, cheap!!!!! to put them in now vs. later. Put your outlets in BEFORE you put in any work-benches, so that if you change your mind/setup, you still have power where you want/need it. Put your outlets at least 54" high to get them above the height of plywood, OSB, Sheetrock etc. 30x40 I'd have at least 6 outlets in the ceiling with retractable extension cords, then you never have to trip over them. 2-3 "lifting rings" over each "stall" well anchored into the strong part of your truss. We've used lifting rings and "come-alongs" to lift/hang deer on gambrel's in Grandpa's shop forever. A 110V winch wouldn't be a bad idea either.
Minimum of 2 50amp 220V plugs. The materials cost less than $150 and are worth their weight in gold if you ever go to sell to a wood or metal worker or someone running a large air compressor for air tools etc. In fact, budget space and $$ for a compressor of your own. If all you ever use it for is to attach an end to blow the dust out of the corners and out the door, it's worth it IMO. Might as well put some outlets on the outside of the building too. 3 down the long sides and 1-2 on each short sides.
You will NEVER regret extra light. You will however cuss shadows. 4-6 rows 36' long should pretty much eliminate shadows. Outside I'd want 3 floods across the short sides and 4 across the long sides. At a minimum the corner lights should be motion activated.
10' sidewalls allow you the freedom to put some windows up high for natural light and some ventilation when necessary but keeps people from seeing in. 3-4 ceiling fans to keep the air moving helps keep things dry.
That should get you started anyway.
