There are lots of web resources and books that could be helpful. Here are a few:

E-resources

Classroom-Support-Strategies-Working-with-EAL-Learners-in-Secondary-Settings.pdf

EAL strategies for secondary school - Videos

Heddle | Community & Support for EAL Teachers

The Bell Foundation - Changing lives and overcoming exclusion through language education

NALDIC | EAL National Subject Association

Books

A Parents' and Teachers' Guide to Bilingualism by Colin Baker ISBN 9781783091591

EAL Pocketbook Paperback by Alice Washbourne ISBN 978-1906610302