The villain known as "The Joker" did not feature in the film "Batman Forever". He does however appear as the main villain in the films "Batman" and "The Dark Knight" being played by Jack Nicholson and Heath Ledger respectively.
Joe Chill, the murderer of Bruce Wayne's parents, is arguably the first Batman villain. The first criminal Batman was ever shown taking down was a thug and murderer by the name of Alfred Stryker. The other oldest villians are: The Penguin, The Joker, The Riddler, and Catwoman.
While Joker is the most prominent member of Batman's Rogues Gallery, he was not the first villain. Batman's first villains were local crime syndicates. The bosses included Carmine Falcone, Sal Maroni, and Rupert Thorne.