When I bought my farm there was no compost bin. I know that it would be best to have atleast a few compost bins. How did you build a compost bin? What were the costs/materials/tools/equipment needed to build it? How much space do I need? Currently my compost bin is way back behind my barn in a wooded area, half of it is in the shade, will this pose a problem with composting? Any other details I should know?