All this writing. All these opinions. The Florida Driver Handbook makes it quite simple:
"Roundabouts are circular intersections with no traffic signal which improve traffic flow and reduce traffic crashes. Roundabouts slow vehicle speed, give drivers more time to judge and react to other vehicles or pedestrians. Drivers entering the roundabout must yield to traffic already in the circle and are directed in one-way, counterclockwise direction. For multi-lane roundabouts, stay in the left lane to turn left and the right lane to turn right, and all lanes to go through, unless otherwise directed by signs or pavement markings. Stay in your lane within the roundabout and use your right turn signal to indicate your intention to exit. Prior to entering or exiting the roundabout, drivers must yield to pedestrians in the crosswalks. Bicyclists may take the lane in the roundabout, or use the sidewalk."
It also has a simple diagram at
Florida Driver Handbook | Roundabouts.