I will consider adding a player-made political entities in the forum post, if not you can use these forums as a place to inform players of your existence.
OOC:
I'm not too sure about the lore behind an Assasins guild, perhaps in the future it may have a more prominent role if it becomes a bigger institution more involved in the politics of the world rather than just being purely evil.
Ah the creation of a guild. Yes, you will need to find a place, hidden, in the Wilds to erect your dark guild. I hope you are void from luck and the blessings of God.