Ok, I figured out Berserker so now I'll share with you guys on how to be one 
First part is of course being lvl 18 and choosing the Berserker quest from the Swordsman trainer.
Quest 1: Talk to the female mage lady in west side.
Quest 2: She wants 81 parts of red cube, 10 ogre power potions, and 2 stones of revenge. Red cubes come from grinding rings (or buy them off koreans in the trade channel), you can talk to the alchemist guy and buy the ogre power recipe and make 30 of them from just 1 scroll, the ingredients are pretty easy. As for the stones of revenge, you have to goto the zombie mission and kill the boss. Upon killing him you get the quest items. After all this is collected, return to the mage chick in west side and you're done.
Quest 3: The easiest one, just go talk to the swordsman trainer! Now you are a berserker woooo
.
Hope this helps anyone wanting to become berserker! If anyone else figures out how to finish their job quest please post how you did it to save everyone LOTS of trial and error!