A job offer does not yet constitute a visa. You should get some more information. Is this an inter company transfer or a US employer?
FL is a rather large piece of real estate:>) Can you tell us where in FL the company is?

Just a few points for contract negotiations: medical insurance, vacation, moving expenses, US/UK contract, overtime, paid trips US/UK, housing allowance ... The list is endless. Tell us a bit more about your individual situation then you can get some good answers.