The first thing you want to do is join United Waterfowlers Florida (UWF). It will be a good $25 investment - you'll meet guys who will help you.
There are over 1,000 members throughout the state.
I came down from CT - hunted CT, RI, NH, VT, and sometimes ME. Yes - it is very different since there is so much water and the ducks will hold up in one area when it all looks the same. You'll also find more different species and more of them.
I'm in Orlando and don't know what opportunities there are up around Jax.