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You will need a federal tax identification number for the business, which you can get online (http://www.irs.gov/businesses/small/article/0,,id=98350,00.html). Also, you'll need to register with the Florida Dept. of Revenue: http://dor.myflorida.com/dor/
If you are going to incorporate, you also need to register with the Florida Secretary of State (http://www.sunbiz.org/downloads.html).