Lilacs need a longer, colder winter chill than we ever get here in Florida.
You can find some wonderful shrubs that will give you as much pleasure as lilacs, though. Try the Plant and Garden Festival at Epcot to do your research and see what you like. I think it's in March. Many of them will bloom for months, instead of just a few weeks like the lilacs do.
Lots of people move here and try to grow all the things they grew up north. It's a big mistake, don't fight the climate, embrace it. Grow things that do well here and enjoy all the new and different things that will grow here that don't grow up north.
