Here are a few tips for gardening in Florida that worked for me. I gardened most successfully very early spring and late fall with traditional cool weather crops such as broccoli, spinach, carrots, lettuces, greens, potatoes, peas and cabbages and such. I found I could grow things like spinach all winter.I haven't been gardening in terms of " seriously" very long. I'm still learning these things, plus I don't have a lot of extra time to put in with keeping up. Reading, trying new ways of growing, etc. Last year being much better harvest for what I planted motivated me to try n do more this year. Gonna get my son to clear out most of this years plants and try n start over if it's not too late. You are right, the soil sucks here, as well as all the various pests. I'm thinking to do a combination of more raised beds and containers. I had a green house built this year, so maybe I can continue on through winter months with some plants. I'm frustrated but not giving up. I am still going to make trip/s to farmers market though and get supplemented what didn't turn out in my garden for canning, freezing, etc.
Raised beds work best to get up out of that sand. Sand to me is a very difficult soil to grow in and I fight it even at my present location. Quick to leach nutrients, dries out easily and eats the organic matter.
As the weather heats up I had the most success growing traditional vegetables in a shade house to provide some protection from the sun. Lack of water could be a huge issue some years and water restrictions were common.
I lived around the Orlando area. Not sure where you are located in Florida. When I first moved to Florida in the late 70's there were still acres and acres of citrus in Central Florida. Today those are all housing developments.