Hi, lots of INFO and Educational Materials on the ARDUINO INFO wiki here - http:/arduinoinfo.info
This link: http://arduino-info.wikispaces.com/StarterSetMenu
has How-To and Educational information for specific Starter Sets. A $32 Starter Set with Arduino-Compatible board with built-in 3-pin connectors, cables, breadboard, components, servo etc. is here: http://goo.gl/dfq8l
In a classroom environment, starting off 5 or 10 students connecting things on breadboards can be difficult and frustrating as lots of time is spent finding and correcting connection problems. Direct cable plug-in of a variety of input and output devices like these "Electronic Bricks" is used by several schools and Universities: http://arduino-info.wikispaces.com/ElectronicBrickStarterSet
Ask for Educational discounts on whatever you use!
DISCLAIMER: Mentioned stuff from my own shop...