Follow the story line and you will get there. The way Pirate101 is setup means you can't get there by yourself without following the story line or having a Friend help you (which is not following the story line). If you have lost the main story line in the quest journal, contact support at support@pirate101.com or use the Help Menu above (the Orange Question Mark).
Hi Trey. Welcome to the message boards. If you question is simply what is the path to Mooshu, here is a great atlas that will tell you what world leads to what.