You will need the FAA licence and it takes around 5-6 weeks to obtain. Plenty of threads on here about the process. Hope it all works for you, it's a great country to fly in. Late summer in Florida is the start of hurricane season and there will be plenty of CB activity. Fortunately they are almost never embedded so you can see and avoid, but expect the afternoons to get very dark. I'd suggest early morning flying, which, with the time change will suit you being on UK time.