There is a wealth of good advice for clerks on the BYM website: https://www.quaker.org.uk/our-organisation/quaker-roles/clerks
There are also more resources on this site including a Quaker’s guide to online worship and meetings.
Books that go discursively into more depth include:
Halliday, Robert, Mind the oneness: the foundation of good Quaker business method. QHS 1991 and reissued 2010.
Loring, Patricia, Listening Spirituality Vol. 1 Personal Spiritual Practice among Friends: 1997, and Vol. 2 Corporate Spiritual Practice among Friends, Openings Press, 1999.
Mace, Jane, God & decision making: a Quaker approach, Quaker Books, 2012.
Morley, Barry, Beyond Consensus: Salvaging Sense of the Meeting, Pendle Hill, 1993.