Starting a club when nobody’s sure it’ll work is how half of the good clubs started.

Everything that exists looked unlikely before it existed. The clubs, teams and traditions that seem permanent were started by somebody with no evidence it would work, usually with four people in a room and a teacher who agreed to sign a form. Waiting for proof of demand is waiting for somebody else to go first.

If there is a thing you wish your school had, find the teacher who has to sponsor it and ask what the actual requirements are. Get two friends to commit to the first three meetings. Small and surviving beats impressive and never started.