seems that a shed would consist of a floor, at least four walls and a roof.....this would require purchasing two by sixes or eights for the floor joices, two by four's for the wall studs and two by eight's for the rafters.....personally, I'd go 8' by 12', have divided rooms inside, but that's just an idea.......oh, and you need some plywood, several sheets, five eighth's should work.....then 30 lb felt for waterproofing outside walls.....and the roof, which should be covered with some kind of roofing materiel, i.e. shingles
you are also going to need tools for this job......hope you have figured this part out ahead of time.....
oh yeah, the shed will need some kind of power source.....you can wire it yourself, or use extension cords.....
then there is the water problem.......got to have water dude.....seems to be part of the formula.....
you know something, this is nuts......I really can't help you anymore.....makes my head hurt trying to figure out your stuff......have a good grow 'smokey'......and what part of California are you from?