The space that I started with.
I used 24 wood stakes to box in each of the four corners. Then I used string, a level, and a square to map out a squared level space where the shed will be.
I then marked where the five poured concrete posts would be (two in the front corners and three in the back corners and center). Following that I started digging.
After I dug the holes I cut concrete forms to length and put them in the holes. Then I mixed and poured concrete and put in the anchor bolts (bolts to make sure the shed doesn't shift on its foundation.
All five post and bolts are in, complete with the left over concrete in a cut out milk container.