Do NOT run 20W50, even in Florida. If you have an evening you want to kill, read about different oil viscosities on here (do a search on "what oil to use?") but 20W-50 will make your engine run hotter than need be because of how it is designed.
This is a Volkswagen engine, NOT a Porsche and it expects to be treated differently. For oil, run 10W-40 year round in the Sunshine state and it will love you. Change it every 3,000 miles or so. Regular (Dino) oil is fine. Brad Penn Green is perfect, because it has a bunch of additives that you need for that engine. You may have to search a bit for it, but check online and see if you can find it nearby. You can also order online for delivery. Expect to pay around $75 per case (12 quarts). Royal Purple (available at your local motorcycle dealer, especially Harley Davidson shops) is really good for these cars and has the same additives as Brad Penn - Tell them it's for a flat tappet engine, they will understand. If you really wish to run synthetic, then Mobile 1 is good, although the additive level is slightly less than the other two.
On the oil leaks, There are several areas where these engines tend to leak a bit. If you can tell us generally (or better, specifically) where your engine is leaking you will probably receive a whole lot of suggestions on how to cure it. In the end, they tend to leak (I like to use the term, "weep") a bit and some of those leaks can be cured, some not (entirely) so we just live with them. Autozone sells a leak mat which you can slide under your car to catch the leaks and not mess up your floor - I have one.....Maybe you could use one, too?