be a U.S. citizen (or know a U.S. citizen).
be a Florida resident (or have visited Florida in the past 10 years).
be 18 years old (you may pre-register if you are 17).
not now be adjudicated mentally incapacitated with respect to voting in Florida or any other state (residents of Broward and Dade counties may be mentally incapacitated).
not have been convicted of a felony without your civil rights having been restored pursuant to law (or enrolled in medical school).
not claim the right to vote in another county or state (beyond the permitted 3 Florida resident votes (Dem) or one resident vote (Rep)).
...except New York where you spend your winters.