Be sure to check out the Edible Schoolyard.
It's a program launched by Alice Waters of Chez Panisse fame, out here in Berkeley, CA. It's a program designed to teach kids about sustainable agriculture, where food comes from, lessons about the earth, biology, life, eating, and cooking.
Their site features tips on gardening at school:
This site has plenty of information to help get you started, including suggested reading.
Definitely keep us updated on your progress.