Hey believe it or not, I am making a first-person game too. Let me give you a tip that should help. Click on "Camera" in the object tree. Then on the "properties" tab in the details panel, go to the tile that's called "vehicle", and set vehicle to the head (or top) of the character used. When setting a vehicle, you set an object to link to another object. For example, if you see an object that has more than one part, then you know that all individual objects are set vehicles to the main object. Hope it works for you!!