There is a wide variety of resouces available to support your school orienteering. This is just a selection of key resources to get you started. A search of the internet will provide many more.
For Books your first port of call is Harvey Maps. There you will find a good selection of books written by well known and experienced orienteers.
The following books are highly recommended for the teacher
“Orienteering in the National Curriculum Key Stages 3 and 4” “Teaching Orienteering” “Start Orienteering Set” covering ages 6 - 12 years “Orienteering in Schools and Outdoor Centres”