Sign up to the Program by visiting: http://edu-vpp.apple.com/asvpp.html
One person at your school will need to register as the Program Manager. At the time of purchase, redeem codes are allocated. These are then distributed to the staff members or students. Each person receiving the code then simply logins to their iTunes account and redeems the code in the same way they do with an iTunes card.
You have read this article with the title Volume Purchase Program - 50% off Apps for Schools. You can bookmark this page URL http://singedwingangel.blogspot.com/2011/02/volume-purchase-program-50-off-apps-for.html. Thanks!