Speak to Captain Vidican in Fort Ganrick to obtain this quest. It is one of the two Quests that you can recieve from the initial town. Be careful in this town, and make sure to go out the secret exit in the storeroom. If you dont, a special event will be triggered, and you will be forced to fight off a Nephilim Attack, which will overpower you at the very start of the game. Gain a few levels and then come back and do this one, for experience.