Okay, I'll be brief to get you started. You can fill in the space with whatever else. 

The anomalies are getting more frequent and the fauna have begun to become frantic around a certain area in the Eclipse. Remember, these are ruins, so the 'zone' is just one massive building to another. The Magistrates have also shown signs towards the area, sending in larger walkers and armed forces. Your character might even hear combat of sorts, but because of the quarantine sectors, they have been unable to get close enough to tell. 

That's been happening for the past few weeks. Today, at least earlier than the events happening with the main cast, you got a weird request from someone to guide them. A message to meet at a place rather close to the walls.

I don't know how your character exactly presents themselves or shows sign of opening guiding services, but I'll leave it to you.