I recommend you use Apple Configurator to manage your 30 iPads. You can use a single Apple ID in Configurator to authorize all iPads and to distribute configuration profiles and apps. You can purchase VPP codes from the VPP Education Store to buy apps and distribute them to your 30 iPads.
Use the resources on this page for details on managing iPads in Education: http://www.apple.com/education/it/
Hope this helps!