Number one, especially in SoFla, is to be yourself. I've lived in Ft Lauderdale for the last six years, and I met a lot of pretenders, phonies and hypocrites, and one or two really nice guys, though for various reasons, no real partner material.
My advice, especially down here:
1) Be open to different types from your standard range of age, ethnicity, race, body type and/or interests.
2) Listen very carefully in the first few minutes/hours of conversation. Very often those are some of the only times he'll be completely open and honest without guile or guard.
3) Take things extremely slowly. Rushing into things will cloud your judgment or make you overlook something that you really should have been paying closer attention to.
4) Keep communicating: do not assume anything, ever.
5) Where you meet guys will determine where the limits are on any budding relationship. Guys down here compartmentalize a lot: if you met on a hook-up website, do not expect it to go any further than sex, or you will be disappointed.
6) Do not presume a lack of interest if he doesn't follow up; if you're interested in seeing him again, call him.
7) Be prepared for drama and skeletons in the closet. People move down here for a fresh start, but frequently lug their crapola down with their clothes. Don't say you weren't warned.
8) Even if it's not drama, be prepared for people with whom you have little or nothing in common. I've lived in "magnet cities" (Boston, New York, Paris) all my life, but I've never met so many people who are utterly unlike anyone I've ever met before.
9) Educate yourself about drugs, especially Crystal Meth. It is an enormous problem down here that affects guys whom you'd never expect to have a problem, including lawyers and business people of all ages. Look for the signs of his "disappearing", especially for more than a day or two, or sudden mood swings: these are both real signs of trouble. Do judge anyone by their "nice, normal" friends: guys with Meth problems compartmentalize their "partying". Never presume that you'd be able to instantly recognize a Meth addict by his appearance or affect.
10) Be extremely wary of anything having to do with money: do not lend him any, do not make purchases for him, do not co-sign anything ever. Equally avoid guys who are throwing cash around like it's nothing but who live with odd frugalities (overly cheap apartment, old car) or their opposites: the guys with Jaguars and high-rise condos who never have any cash to split a pizza or go to the movies. If it seems to good to be true, then something's wrong. Never never never discuss your finances, especially small windfalls like a bonus or a tax refund, and never never never discuss any annuities or inheritences you might have until you have known someone a long time (I'd say more than two years).
I have had direct experience in all these things, and some others, too. I never considered myself a fool, but spent several years being played for one, and I'm in my late 40s. A guy in his 20s in good health has much more to lose than me. Trust me on this.