Wanting to build a garage (Need advice)

you can't have enough receptacles.-x2. my father in law wired his outlets so that they alternated phases of the 230v as you went around the room. Helps keep the load balanced, and reduces overloading breakers. He even made an adapter so he could run light 230v loads off adjacent outlets. when you think you have enough outlets, at least double them up. (2 duplex at each position instead of one, and that lets you use 12/3 w ground for getting both phases instead of 2x 12/2 w ground, they can share common and ground wires)