Welcome to the boards, megan! May you find life in the Gael Serran to be full of friendly and helpful critters, just like here in the forums.
And actually, the most common question is how to get into the crypt. You can't get to Ishad N'ha until you do that, because there's one key item you need. Ask away if you want more spoilers on that. [img]smile.gif[/img]
For your actual question, you need to reset adventures to start a new game. If you go into the game options (little computer button on the bottom left), there's an option to reset adventures. Click that, and your characters will be back at the start, with all the equipment and weapons they had before, but less any quest items you may have uncovered.
When you reset, you can use the same characters as before, or you can create some new ones.
Enjoy! And welcome aboard [img]graemlins/cheers.gif[/img]