These are some of the places to look:
UF IFAS Extension, "Zoysiagrass for Florida Lawns
http://edis.ifas.ufl.edu/pp154 "homeowner's guide to fungicides for the lawn"
http://edis.ifas.ufl.edu/Ih034 "Insect management in your Florida Lawn"
""" LH025 "Watering Your Florida Lawn"
"""ENH962 "Figuring out Fertilizer for thr Home Lawn"
"""ENH979 "Homeowner Best Management Practices for the Home Lawn"
http://solutionsforyourlife.ufl.edu/map
The FL extension also offers plant clinics and lanscape talks in the villages which would be listed in the paper or call the extension office
Even if you don't become a do it yourselfer, you will at least have some knowledge so you won't be bamboozeled and will know what questions to ask these companies. good luck