I wanted to have numerous outlets, and have enough electrical service that I did not have to worry about overloading circuits. There was already some lighting, so I simply picked off that line and added additional lights to keep things bright and cozy. I ran a 240V line for the table saw and jointer with a dedicated breaker. For wall outlets, I ran 14-3 wire, and split all the plugs, so that I can run one machine on the upper plug, and another on the lower plug of any outlet.
Unless you’re a big fan of frequent shop remodeling, planning the layout of your workshop early in its development will save you a lot of time and trouble and also can keep you from spending years in an uncomfortable, poorly organized space. And if you already work in a shop that’s as organized as a trailer park after a tornado, careful planning and a little remodeling is likely to help you make a quantum leap.