What is the first thing that i should do if i am served with a summons and complaint in Florida?

The first thing you should realize is that you have to file an answer to that complaint within 20 days. You have to serve that answer on the other party, their attorney, and the Clerk of Court.

Another thing you should probably do is consider consulting with an experienced family law attorney so that they can give you some information about what your particular divorce papers mean, and how it could affect your children, your property, and any other issue having to do with your marriage.