There is no such thing as searching for prime sources. They will appear randomly on the map when stories happen nearby. That is one reason why things such as villages, etc. have locations on the map.
During the alpha test, I will simply throw Prime sources out there randomly whenever a chapter is accepted. In the actual game, the prime sources will actually be there to discover.
So how to find Prime sources? Write good stories about things going on in the world. Prime sources are discovered by heroes or other humans as they act.
