You need to know your costs down to a t before you can determine an hourly rate.
Add up the total cost for the entire year(don't forget anything, lots of small bills can add up, there should be things such as maintenance and repair costs built into your budget. Your salary and company profit should be part of that total, base it off of) then divide by billable hours and you get what you need to make per hr to reach your goals.
Similar to what Duekster said don't forget to account for seasonal changes. I'm unfamiliar with the Florida market, We do our proformas and budgets over 8 months