Elena, To our knowledge there are no specific forms for pro se litigants to use to file a defamation case. Defamation is a tort- a personal injury. If you're intent on proceeding pro se, we suggest that you find examples of this type of case and create your own complaint based on a similar case. Although there are not exact forms, there are certain things that you must include in your complaint to pursue it. First, are the jurisdictional allegations. These are basically the reasons that you are pursuing your case in a specific forum - circuit, county, or small claims. Jurisdictional allegations include not only the dollar range that you're seeking, but also where the defamation took place.
After that you will decipher the elements of defamation and apply them to your facts.
Under Florida law, the elements of a defamation claim are:
1. The defendant published a false statement; about the plaintiff; 2. To a third party; and 3. The falsity of the statement caused injury to the plaintiff.