French, German, Spanish Language Support

I need to set up a computer lab at my High School for the Language Arts teachers. They want their students to be able to write and edit MS Word and other office (2003) applications in English, Spanish, German, French and Japanese.
My department has licensed the MS Office MUI pack so that I can do the installation.

Can someone point me towards a set of directions for proper installation. I want the primary language to be English with the user having the ability to switch between languages easily.

I confess to knowing no other language beyond English and a big concern of mine is that I am not sure how to test and verify that the other languages are correctly installed.

Any help would be greatly appreciated.