My 1st garage

Put in lots of plug ins even if you dont have enough electrical equipment, install at least 1 220 volt outlet for welder/ compressor. when you run underground counduit for your electrical from the house put in an extra conduit with a fish wire for future add ons. plan a plug in in the ceiling where you might put a overhead garage door opener. run wiring for extra lights in the future and speaker wire, even if you don't have it yet. Easier to do these things before.
install all your walk in doors to swing out so you don't loose any interior space. Put two by sixes between studs for mounting future cabinets etc. plan plan and execute.

plumb in gas even if you dont hook it up, get a mid or high effecient furnace and hand sideways from the ceiling so you dont loose space.