Under the Duty section of the menu is an option for Recommendations. That will show you any recommended quests in your zone. It can be very helpful early on to find things and remind you of where to go.

Otherwise, as mentioned, you will need to do your level 10 marauder quest to unlock the ability to get other classes. Once you have done that quest you can pick up the other classes by visiting the appropriate guild and equipping the weapon they give you.

And the autotranslator quest is annoying.