I need to make cubbies for my son's kindergarten classroom, it needs to have 30 cubbies each being 9"W x 12"D x 24"H so I have decided to make two with 15 cubbies each. How would you make the cubby sections? What kind of cuts would you use to install the cubby shelves?

The best website for easy free plans is www.ana-white.com She has a couple of different sized cubby plans, just read through the instructions and it won't be hard to come up with your own tailored to the dimensions you need yours to be.

Wall Cubby Shelf Plans:
http://ana-white.com/2010/06/furniture-plans-wall-cubby-shelf.html

Rolling or Built-In Cubbies
http://ana-white.com/2010/03/plans-2x4-rolling-cubbies-console-table-to-built-ins.html

There are a few others as well if you search around her site. Hope this helps!