[dsraven]

how big is your shed?
my electrical system for garage-24x30-10ft ceiling-2 big doors and 1 man door-cold climate
-check home depot etc for a deal on the panel with breakers already in. possibly cheaper that way. you may need to buy some additional ones as well but it's a start. my shop breaker panel is in the shop and has as many circuits as the house has
-wire it like a kitchen so the plugs are split circuits. then you can plug in 2 power hogs and not blow the circuit
-install the plugs just a bit higher than 4 ft (then floor jacks or parts boxes can be placed anywhere around the perimeter) so they can be easily reached even if you lean a sheet of plywood against the wall. place plugs every 8 ft so you need less cords. -install a 20 amp plug on each side wall 1/2 way from front to rear for those heavy duty tools like a table saw or whatever
-wire in a thermostat, wire to where the heater will likely be, and install a box even if there is no heater yet
-install outside lights and plugs on each exterior wall. switch each ext light separately
wire in some lights in the attic if you plan to store stuff up there some day
-run a string of lights down each wall and down the center, plus across the front where the bench will be. switch them separately. if using fluorescents have a regular bulb socket somewhere near the entrance door so if you are only going in the shop for something quick you don't need to turn on all the big lights, saves on ballasts etc in the long term
-run the wire for an rv plug on the outside if applicable
-run wire and plug for a welder somewhere in the front middle so access from anywhere. try not to place it under the workbench unless you plan to extend it out nfor access
-install a receptacle somewhere near the man door with a usb plug in it for the phone charger. place backing for shelf hangers as well
-run wire for a compressor on both front corners and make it oversized for the amperage of a larger compressor in the future, if that is where your plan is to have the compressor placed, so if you change the floor plan around later you have options. also, if it is at the other end of the shop, you may need to squeeze past stuff to turn the compressor on/off. if heating the shop try to place the compressor somewhere in the blower path to warm the unit up when the heat comes on, if you turn the heat off overnight
-install attic hatches front and rear so you can store stuff up there if needed (false floor in mine at 18" above ceiling and blown in insulation. handy). if you plan to finish the cieling
-run the air inlet for the compressor into the attic with a filter on it up there. becomes a lot less noisy in the shop (assuming you finish the ceiling and insulate)
-run air lines across ceiling at the front with a couple drops for the workbench, then down each side at least 1/2 way with drops in the center of the bay(s) have an airline to the shop big door
-if you plan to finish the walls with drywall think about a strip of treated wood about a foot tall around the bottom. then if it gets wet on the floor the drywall won't leach up the water. try not to sheet the walls with plywood on the inside, it is flammable and burns hot. metal siding on the inside would be an option I would think about if building another shop
install backing for shelves or cupboards etc before sheeting the walls. think about if you ever plan on installing air hose reels or cord reels in the future as well. they would need backing