You might need a resale license. I’m in California and got mine from the Board of Equalization. There was no fee. If you’re going to charge tax, a tax calculation sheet is helpful. Or, you can add it into the price. Also, get a receipt book and use it for each sale.
The forms to fill out for here in Utah are on utah.gov. At ROSE we also have someone from the Tax commission go to the first day of the show so that if anyone has any questions on how to fill it out they have someone there to ask. Last year we also send the forms to the vendors ahead of time so that they would have time to fill them out.
I am not sure as I have never done a show in Florida. I would contact the people that are putting the show on and ask them. They should have the information for you.