i always go fighter then as soon as i get in to the game i dual to mage, basicallly, always do the tutorial when starting a new game so you can dual when you get in to the tutorial and you get some good xp for not much and if you dont want to dual instantly it works if your just about to level up (ie have the level up icon on your screen but havent done it yet) dual then, and when you dual to the next clss you get the level up and you get a head start.

dual tricks?

this works on solo dualed classes well

1.
when you dual class FROM fighter, always wait wait wait wait till you surpass the old fighter level before you hit the level up bottom.

that way, you can add the weapon proficiency on the fighter's slots. (unless you dont care)

2.
when you do quest, DON'T get the rewarding exp. wait till you dual. once you dualed class, now go get the rewards. bam, free level ups