Here is a web site that answers almost all the questions:
Renew or Replace Your Florida Driver License or ID Card - Florida Highway Safety and Motor Vehicles
I did call the Sumter Annex to find out if going in person is an appointment needed? No, first come first served.
As far as online I did not qualify since my first renewal (8 years ago) was by expedited method i.e. online...hence must go in person this time.
There is more than one site that will promote doing it (for you) on line. I recommend using the site on the FL DMV web page above.
That is what I learned today.....every 8 years results in no memories of what was done/required/etc.