just guessing you will electric in your shed. what i did in my previous shed was to wire it with a separate breaker/fuse box. that way when i used it i could turn the power on when i was working in it. i also had a small fridge for all the necessities, that way i didn't have to make trips to the house for drinks, snacks etc.
and i had wall outlets every 6 feet so that i had access from any point in the shed. and lights were the ceiling flourescent type. better lighting and cheaper on the juice bill. the wall outlets were set above the level of the work bench so that there was no bending over to plug and unplug.
and the work bench heighth was set so i could put my roller tool cabinent underneath, so i had easy access to tools and didn't take up shelf space.
i put hooks in the ceiling rafters so i could hang things to dry after painting as needed.
my shed interior was ten by twelve feet, and that seemed to work for me. the interior heighth was eight feet standard. had one window, and my heating was a small prpane heater found in camping supplies.
hope this helps you......
reb