Congratulations on your move, as St. Pete is a great place to be, and while it takes some time to get used to the heat and humidity, the beaches, fishing and laid-back rhythms of life make it easy to adapt. Additionally, as you are searching for a job, I think it would be helpful to network locally as the Tampa-St. Pete area has a very nice blend of opportunities, and word-of-mouth, although antiquated, works and goes a long way down here. Housing moves rather quickly, so if you are selling in Arkansas, I would find a rental or short-term place to stay ahead of time. Florida registration and insurance also takes some time, so if you can, attend to that shortly after arrival.
It's completely normal to feel anxious, but I promise when you find yourself near the Gulf with a rod in your hand, you will remember why you have made the move.