Duh he goes to Yavin 4. Then all of the dead jedi's ghosts come to him including Mace Windu, Anakin Skywalker, Yoda, and Obi-Wan Kenobi tell him that he is to make a new jedi order.
Luke Skywalker leads a new Jedi Order, gets married to Mara Jade, and has a son named Ben, after his old mentor Ben Kenobi. All of this information can be read in lots of various books.