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.
"You should do at least one thing every day that scares you." – Kurt Caselli