(IMHO) When asking questions about sustainable (and profitable) food forests in Florida, get used to the sound of crickets chirping. That's about all the advice you are going to get.
I am by no means an expert. My only knowledge is from a few years observing our local environment and listening to the advice of others.
I've turned my attention from broad scale food forests to backyard food forest, or horticulture maybe a more precise term. And fortunately for me I have an interest in greywater and rain harvesting.
Although some of my early experiments are showing signs of success I am skeptical that a food forest in Florida sand would survive a year or two without a significant amount of inputs.
Some random thoughts:
If you can harvest the greywater and a large amount of pavement runoff from a mobile home park, say 200 units, you may be able to pipe in enough nutrient to make a sizable and profitable food forest.
Another idea may be to use your greywater and blackwater put into a built lagoon. This could be used to grow fodder for livestock.... And think bees, always think about the bees. You won't get anything accomplished without bees.
Another approach may be to truck in large amounts of municipal shredded mulch from local towns. Citrus county has a good program. Use that as bedding for some kind of livestock such as chickens or turkeys. After exposure to manure and some good turning by chickens, etc, work that into some garden beds and eventually your perimeter food forest.
I don't believe any single approach will work. It will take a variety of disciplines and years of experimentation. Think bees, aquaculture, poultry, ducks, turkeys, perhaps a goat. And perhaps consider participation in some kind of fishing, or managed hunting of wild hog and turkeys.
You may want to follow Jack Spirko and The Survival Podcast. Tons of great information on sustainable living and permaculture that is relevant to the Florida landscape.
Another important thing to remember is the frequency of frost. The frost belt can shift dramatically from decade to decade. But generally speaking the zone south of Tampa Bay along the west coast is frost free. And the area inland south of highway 60 is frost free with a few exceptions. Inland lowlands can become frosty. But that just determines your selection of elements.
I consider sustainable permaculture in Florida and the Gulf Coast area to be one of the greatest and possibly most rewarding science and occupation of the new century.
Let me know if you found this useful.