I am not an admin... Furthermore, the correct term is cities. Colonies are cities placed on alien planets, and having a seperate page just for colonies or renaming the page just of this tiny detail seems useless.
Other empires will indeed attack the Void Eyes first. If you are interested in joining, I have send you a friend request in Discord that you'll need to accept so I can invite you to the war channel.
I'm still thinking on what galaxy to put it, I don't know if an already existing one or a now one I have to create
You are unable to create new galaxies. Some galaxies are closed, or you must ask for permission to join them. The only free galaxies open that you can join without permission are the Milky Way, Mirus, or Andromeda.
However, you can place your fiction outside of the fiction universe, however interacting with another empire or posting on the universal discussion board will transfer your empire to the fiction universe.