This is the main area of Gudar's Church, and is where you will find his key, although you will have to go through a couple of other areas to get to it.
Location A: This stairyway leads to Area 2, Location
D.
Location B: This doorway leads to Area 4, Location A.
Location C: This doorway leads to Area 6 Location A.
Location D: This doorway leads to Area 7 Location A.
Location E: This stairway goes down to Area 2, Location
A.
Location F: This guy guards Gudar's Tomb, so to
speak. If you talk to him he will give you Gudar's Key.
Location G: This is Gudar's Tomb, remember where it is
for a later quest.
Location H: This treasure chest is empty.
Location I: This doorway leads to Area 5,
Location D.
Location J: There are 55 gp hidden in this crate.
Location K: This stairway leads down to a storage room
of sorts, but I didn't find anything in there.