Regarding Florida, yes, you’ll need to make sure your subs have worker’s comp insurance. And as an independent contractor (GC) even with no employees, you need worker’s comp insurance too. One of the blessings of living in Florida! Here’s a legal site with answers to these questions for GCs… I’ve provided 2 article links on Worker’s comp insurance. Your best bet may be to visit with other contractors to find out where they get their workers comp insurance. If you had employees, you can often get it through a payroll company, but otherwise I’m in AZ, and not sure who’s best for worker’s comp in your local area. Best!
https://fitsmallbusiness.com/fica-taxes-unemployment-insurance-and-workers-comp/ < --2018 rules https://fitsmallbusiness.com/workers-compensation-insurance/ <--2017 more general info / where to by