Run the JAR files you have from Sun through WebSphere's Application Assembly tool. That will add the additional WebSphere configuration files necessary to deploy them.
Then use WebSphere'a Admin console to deploy the application into your application server.
Before doing this, I would run through the deployment example in the WebSphere infocenter, though, to understand what you are doing. Also be careful, if the Sun tutorial you are using is for
J2EE 1.4 it WILL NOT work on WebSphere since WebSphere currently supports J2EE 1.3.
Kyle