Might try RidewithGPS or contacting the Sumter Landing Bike Club on their website. Otherwise this is the route I would start with for planning. Depending on extra time I would follow the West Orange Bike Trail up the south-east to east side of Lake Apopka, but that will add distance and time. The route I have incorporates some of the club ride routes in the Yalaha and Howie in the Hills areas.
This link will take you to my map.