Car hire is essential, there are several car rentals you can choose from at Sanford or Orlando Airport.
We always book with Alamo. If you book Alamo through the Virgin Atlantic website you can book online and check in online and then when you get to the airport you just select your car from the appropriate category and drive away (there is a checkout kiosk where they ask you for your documents).
There was a requirement a couple of years ago, where you had to have an international driving licence, but that is no longer require.
If you have a blue badge you can no longer use this in Florida, you have to apply online to taxpayer department at Polk County and providing you meet their criteria they will email you details of how to apply and pay for a temporary pass.