Essentially you prorate the tax issues between your personal and business (rental) use. So if you rent it for 9 months and use it personally for 3 months, then you have a 75-25% split.
You declare your gross rental income and you can take off that 75% of the mortgage interest, insurance, property taxes, upkeep, off that and what is left (if any) is your income. On your taxes, you take 25% of the taxes paid and mortgage interest and you can put that on your itemized deductions (subject to the various caps and standard deduction).
When you sell you owe capital gains on the difference between the sales price and the basis. Selling expenses come off of that (for both your residential and business use). You'll have to recapture the depreciation (whether you took it or not). Since this isn't going to be your principal residence, you do not get to use the capital gain exclusion to avoid tax on the gain.
Note that capital gains is a FEDERAL thing. There's no personal income tax in Florida.
Here's a pretty good description I found googling:
https://www.trustbgw.com/question/rent-vacation-home-part-year-considered-income-tax-consequences/