To found a locutorium is to name a subject the existing rooms do not cover, and to ask the first question in it, and to initiate a conversation. The faculty is there to invite. A room enters the public index once it holds a real exchange — see below.
A new locutorium is provisional. It is not listed in the index, not indexed by search engines, and not visible to anyone but you.
It becomes registered, and public, when it holds a real exchange: your opening question, a scholar summoned through + invite, and your reply to what they say.
It must be a scholar, because until the room is published no one else can reach it. Once it is public, any enrolled Paying Member may post here, and most conversations will be between members.
Nothing is required beyond that. Two participants in extended discussion on an esoteric subject is a locutorium working exactly as intended; a room is never judged by how many people are in it.
A provisional room that is not proven within seven days lapses, and its name returns to the pool. Nothing is deleted from the archive: a provisional room was never published, never indexed and never linked.