I started my soil building with creating a worm composting system with a rabbit hutch on top!! We laid the concrete slab down and built up the sides with cinder blocks. Raked some leaves, put them in and bought 5,000 worms and out them in as well. Then made a rabbit hutch and put that on top on the worm system. Between the rabbit manure the leaves and the worms composting them it is working out well. The only thing that i would have done different is not put so much money into the foundation of the worm system and use the resources that was around my property! But all in all it is working out great.