Our Guide to Teaching Go (PDF) 
Information about Teaching Beginners is also available in Chapter 4 of the Club Organiser's Handbook. 
We also have equipment and other literature that you can borrow/use. See here  for the current status.
We also have access to a dedicated KGS account  that we use for teaching purposes (to Association members only).
Please note that we have an Accreditation System  for those who wish to teach in the UK.