just start with
tomcat !
you'll love it !! ! ! ! !!
you can deploy it on any current pc no big woop (windows,linux). When you get over 5000 users check out a jboss book at barnes and noble.
A good question to ask oneself when deciding on tomcat... or jboss.
1. Heavy DOOTY users DAILY? (i.e. 5000000 )
answer: Jboss
2. My development server to learn on ( i.e. tomcat runs inside jboss 2006 )it's a JSP/SERVLET application server. Jboss is a
J2EE server. If you don't know what an EJB is ... learn on tomcat.