Before designing a Food Forest you need to be clear on what your goal is. Because a goal of growing enough food for your family with as little work required from you as possible, versus you creating a community hub and demonstration site, versus you wanting as much food production as possible so you can sell your extra to local restaurants and create value added products to sell at farmers markets, all of those could be done on the same plot of land, but what you plant and what systems you set up would be significantly different.