Ten random thoughts on the food forest ... 1) make sure you can walk to it 2) can it produce 2,000 calories (+/-) per day year round (remember you can dry store stuff) 3) diversity - the more the better - no monoculture for us 4) can you personally cultivate it with manual tools 5) look to native plants 6) research indigenous practices for your area 7) what is your storage plan in the event of a single year or multi year no-growth event
medicinal plants 9) clean water (can you hand dig a well?) 10) beekeeping - ancient practice, plenty of calories, requires no storage, helps your forest. There are many more ideas I am sure and many may not agree with this short list but please let me know what you think.