I think the best thing to do is find a SAR group near you (there are several in FL) and ask to visit with them first. Some have outside funding to help, others don't and they have various differing requirements.
We tell prospects to expect to spend 2-3K per year on SAR related expenses out of pocket. All states/teams will expect ISC 100, 200, 700, 800, and 809 at a minimum, all free and online through FEMA. There are also classrom ICS 300 and 400 courses that many take but don't worry about now.
has SAR tech III, then SAR Tech II requirements that many teams require even if they use other agences for canine certification.
There is also disaster vs wilderness SAR, with disaster being a few elite groups though some state disaster groups have come up as well.
As far as employers, well that depends on yours. Even if I were young and fit enough to want to do disaster I could not be gone for several weeks at a time which is how FEMA deployments sometimes work. Most wilderness calls are a day or two and it is ENTIRELY between you and the employter. Some teams require a letter from your boss before they will even let you join.
Most trainings and meetings are open to folks who are not on SAR teams. NASAR has a big meeting in Myrtle Beach this May [I am not going because I will just be getting back from a cadaver dog seminar and can't afford to do both / take PTO for both]
Don't worry about what to look for in a SAR dog until you try it out with a team without a dog first. You need to be prepared in FL that poisonous snakes and gators are the norm but if a human life is at stake, putting the dog at risk is, well, that is SAR.
So number one. Find a team first and just talk with them ask to come to some trainings.
Number two. Don't get that dog YET. Follow their lead.