I have been reading up on the "story" of Star Wars and have found that the story involved has actually continued long after the end of Episode IV.
Many interesting things happen that would make great film series; such as when Luke becomes Jedi Grand Master, marries someone called Mara Jade, trains Leia in the Force, creates the New Jedi Order and teaches new Jedi. Leia marries Han Solo, have three kids, one of them, Jacen Solo, turns to the dark side and takes up the name Darth Caedus, replacing Darth Vader as Dark Lord of the Sith