Give teachers a network map. They have to know what's available on the school network in order to use it. Teachers may go for weeks, even months, without using some of the network's resources and then forget what's available. A map that's stored on the network is easy to access, but few people will remember it when they need it. Paper is better.
Teachers can keep it by their computers.
Distribute a new one when necessary. Train technology support staff. Be sure they understand what your teachers are doing on the network. Put useful resources on the network. Your technology specialist can put widely used clip art and photo collections in a network folder that all teachers and students can access.