In my opinion, you would be much better served by a short-term rental, for at least your first season. Once you get to an area that you like, you can investigate buying a site or taking our an annual rental contract.
Committing to a site before spending a season there would be financially foolish. If Florida is like Arizona, where we spend most of our winters, there are hundreds of parks to choose from, and monthly rentals are readily available, especially if you reserve several months in advance.
For example, one very nice park in Mesa, Arizona rents spaces for around $2,000 plus utilities for three months in the winter, but charges around $5,000 for an annual contract:Valle del Oro rate card
You would have a very tough time renting out a site in the off season. There are hundreds, maybe thousands, of such sites for rent in Mesa alone during the summer.
Good luck with your exploration. It should be fun!