Welcome to Sailnet.
Generally, the beginner sailing courses expect that the students are just that: beginners. You are not expected to have been on a boat before.
On the other hand, if you take a class with other students it could be that there are a wide variety of experiences. The instructor should
ask and adjust the class accordingly. It's a good thing to let your instructor know your experience level so that he or she can be sure to go over the basics with you.
You aren't expected to have taken other boating courses prior to a beginner course. Most schools will give you a test at the end and if you pass you'll end up with whatever state certification the state in which you took the course requires.
Now, when you decide to take advanced courses, proof of passing the prerequisite courses will be needed. I know American Sailing Association
(ASA) saves that information in their database so if you become a member, it's stamped on the back of your member card. I'm sure there's an ASA course being given in Tampa or nearby. The website has a locator page.
Hands on, face-to-face courses are infinitely better than most online courses.
I would have your DL with you just in case. Not because the instructor will need it but, well, accidents do happen.