36x48 main enclosed space with 12x48 shed roof along one side, 2300 sq. ft.
concrete inside, optional under shed roof
6x6 posts on 12' centers (but clearspan across interior space--your codes may vary)
(I like a short course of concrete block for foundation, but walls can be built on pad)
frame interior walls between posts
windows, doors, plumbing, electrical, . . . think about it a lot--it will be hard and expensive to do some things later, easy now.
"I hope it feels so good to be right. There's nothing more exhilarating than pointing out the shortcomings of others, is there?" Randal Graves