You could look through the articles about various people's coops.
Hoop coops are often relatively cheap, and might be a good choice for your situation.
Here are some examples:
https://www.backyardchickens.com/articles/my-chicken-tractor-1.48925/
https://www.backyardchickens.com/articles/aarts-hoop-coop-chicken-tractor.72211/
One of these uses PVC pipe to support the top, the other uses a wire mesh "cattle panel" for support. One is covered with chicken wire (cheaper), the other is covered with hardware cloth (stronger, more resistant to predators.) Both of these have wheels, but you can skip those if it stays in one place, or if you are willing to just drag it across the ground to a new place on occasion. Both of them use tarps on top to keep off rain, and provide some wind protection. The ends do not have tarps, so they have good ventilation, and it also lets heat out so the birds don't get too hot.
Since you are in Florida, you will need to make sure your chickens stay cool enough (shade, ventilation, plenty of water.) Your weather will not get cold enough to bother them, at least after they are a few weeks old and have feathers.
Here is a different style of coop, that is also good in hot weather:
https://www.backyardchickens.com/articles/hot-weather-coops.72760/
You probably do not need any solid walls, but you could use many other styles of coop plans if you replace the solid walls (plywood or siding) with wire mesh (1/2 inch hardware cloth is usually a good choice.) The framing would usually be the same either way.
You could drag the pen to a new place every day or every few days. That does not keep them off the ground, but it does put them on new ground, so the mites cannot build up in one place for very long.
If your chickens are old enough to sleep on roosts, that will keep them off the ground at night. Otherwise, you could put make a floor and put the hoop coop on top of it.
If you are raising the kind of market birds that are ready to butcher in just 2 months, they will not sleep on roosts. But they will also have trouble flying or walking up into a raised area. So they just need to live on one level. (They are the white ones called Cornish Cross.)
If you are raising ones that live for 6 months, then they can usually learn to sleep on roosts, usually between 1 month and 2 months.
