Because I had a fair amount of trouble figuring out how to install and use Tomcat (as a totally new and naive Tomcat user), I wrote up an introductory description for my class. I am offering it to the Tomcat community for anyone who may find it useful. It is available at:
http://abbott.calstatela.edu/courses/cs320b/Running%20a%20Servlet%20under%20Tomcat.html -- Russ Abbott