First do a soil test, plant a soil building cover crop, get some local animal manures that are clean(NOT commercial manures) and start a compost pile. seek out leaves, rotted hay, straw or sawdust. . Explore biodynamic agriculture . get some animals on the lqand (After you build a shelter, get water and fencing ) . Do not buy in anything except minerals seaweeds... watch out for any "Fertilizers" organic or not. They are full of industrial ag waste products .Learn to save seeds :)Sharon