Suggest you talk to Greensmiths,
Pest Control, Lawn Care - Green Smiths - The Villages, Florida for fertilizaiton and pest control and
Oxford Lawn - Lawn Care, Lawn Mowing for lawn rehab and remediation. They talk to each other and work together and can bring your lawn back. They will also make recommendations for watering schedules based on location. I have been using them for the last 6 years and am more that pleased.