The ACBL has a lot of good information about the jobs and
responsibilities of unit boards.
On their site, in the "About ACBL" section, there's a subsection
"Units and Districts," and if you scroll the Units part, there are
links that include a Handbook for Units. If you'll be sending emails
on behalf of the unit (official business), we use "Marketing
Solutions by Pianola" for that.
https://acbl.org/administration/#units
The other relevant document is the ACBL Codification, which is a 400
page document, bur 8 pages are dedicated to Units (starting on page
71): https://web2.acbl.org/codification/Codification.pdf
The Codification is also a treasure trove of everything you ever
wanted to know about ACBL operations and administration.
I know there are contacts at HQ who will support unit boards with
requests, but I'll have to find out who that is.
Cheers,
Mojo