Smelly AC on first start up? 81.5K miles Florida driven.
Mildew in your AC system. Needs a bit of cleaning. Many products and techniques for doing this. I prefer mixing some Odo-Ban cleaner with hot water and pouring it a the base of the windshield in the evening (car parked outside!) and letting it sit overnight. Usually does the trick in one application. And I live in Florida, too.