Villager: The Werewolf gets stronger the longer the game lasts so you'd better find out who he is and you must do it as fast as possible.
You can try and kill him during daylight while he's a simple villager, or dig in at your base and try to hold him out! The first and most important thing is to build a tent far from the castle, but close to your occupation.
There are several types of jobs that you can choose to get the income flowing. You can try fishing, that works mostly in the early stages of the game.