Have you seen heard the saying about good cattlemen being great grass farmers first? Well, good pastures will save you lots of money. How many animals you graze really depends on many factors:
-Condition of soil
-Condition of pasture
-Whether or not you fertilize
-How often you mow the pasture
-Constant grazing versus rotational grazing, (we rotate because it helps rest the pastures and cuts down on worm reinfestation when you drag and mow between rotations)
-Weed control
-Type of grasses or mix of grasses and when they grow best/die off, (coastal, bahia, winter rye).
-Regional differences. We're in FL too, but it varies greatly depending on where you are: either low and close to water or higher and drier in the pines.
Start with your extension agent and a soil test. Then, plan out your pasture management. Once you have a sound pasture management plan in operation, then, you can calculate how many cattle you can run on your pastures.
Good luck!