Hey Lars! Welcome to our club!
A few pointers for starting the game, you can change your class at any time past level 10, and can have every class on one character! Classes that you level later get an experience bonus to help them level. Some points of the story ask you to complete a dungeon or trial, which people are usually up for helping with here.
There's also a huge stretch of story where it feels like forever to go to the first expansion, but i think many can back me up on this and say the story is worth your attention. That being said, don't rush through the story! Enjoy it at your pace!