How do I organise my club's boards?

Manage → Threads. Each thread is a board with its own name, description, position in the list, and separate read and write permissions on the role ladder.

That is how most clubs are structured: an announcements thread everyone can read and only admins can write, a general thread open to members, and sometimes a moderators-only thread. A thread can also be unpublished while you prepare it.

Start with two or three. Empty boards make a club look quieter than it is.