When I taught keyboarding, I introduced all my students to a website called Learn2Type. It is free and you can set up a school account and see the progress of each of your students as they work through the drills. Learn2TypeforSchools
The program we purchased for our students was MicroType 5--"an alphabetic, numeric, skillbuilding, and keypad program with motivating graphics, games, and a word processor with built-in timer." This software program teaches correct finger placement and builds basic skills, then works on speed and accuracy. It is produced by South-Western Educational Publishing. I've provided a link to the website where you can request an examination copy. (http://www.cengage.com/search/productOverview.do?N=+16+11&Ntk=P_Isbn13&Ntt=9780538449809) You can purchase individual or network licensing. The Academic Superstore has pricing for it also (http://www.academicsuperstore.com/).
Another popular program Mavis Beacon by Broderbund is available online as well as through a licensing agreement. "Mavis Beacon Teaches Typing® makes it fun to improve keyboarding skills with typing practice and games that focus on speed, accuracy and rhythm. Mavis Beacon Teaches Typing utilizes a proven method of typing instruction to help keyboarders, from novice to experienced, improve typing skills."
Hope these suggestions give you some ideas for your school. I'd be interested in what typing program you decide to use.