call the local utility, have them do a spot sheet , get a sparky in with a 200 amp meter base, amst, conduit , 4/0 alum wire, and panel, set up the service on the shed, put in a few thousand whats of metal halide lighting some ventalation and voila, your grow op is up and running.
Oh wait you just want ONE plug,,,, ah well then get someone who is good at what they do electrically and have them fish in a wire to the panel, hopefully you have a breaker space, if not have them install a little mini panel somewhere doable. and run a line out to the shed