What filter system to use?

I have a new 55 gal tank to put salt water fish in. I live in the Florida 
keys so access to the good water & fish is not a problem.

I will start with an undergravel filter because I have it. 

The next step is a wet/dry filter with bacteria laden media?

How about a protein skimmer?? Any good web-sites??

-- 
Jim Wyatt
Florida Keys Reef-Divers, Inc.
www.reef-divers.com