One of the nicer explanations of everything can be found at:
java.sun.com/.../index.html

Chapter 3 is all about Tomcat
Chapter 15 is all about JSPs

You can put a jsp  anywhere you would put a regular web page.

You can create a folder  under your tomcat  webapps folder as would occur if
you were to create a new web application besides ROOT or make new folders
under ROOT.