1) google struts, and read everything; understand the framework.
2) download the struts binaries from struts.apache.org.
3) play with the starter app that comes with struts.
4) modify struts-config.xml, write action classes, use validation.
5) post specific questions about problems you experience.

Copy the struts-blank directory in the Tomcat webapps directory and
amplify this step by step.

Or use an better Framework like

http://www.heinerkuecker.de/Cnc.html

Online Demo available at

http://www.control-and-command.de

Heiner Kuecker
Internet: http://www.heinerkuecker.de  http://www.heiner-kuecker.de
JSP WorkFlow PageFlow Page Flow FlowControl Navigation: http://www.control-and-command.de
Expression Language Parser: http://www.heinerkuecker.de/Expression.html

Anzime has a good response.  Lots to read about Struts.

Get to know the controller servlet and how it redirects actions with form
data.  The controller is configured via the struts-config.xml.

Get to know the action class and its responsibility.  Careful to correctly
use the model-view-controller concept and not mix too much logic in
presentation of data.  You lose the idea of Struts and its separation of
duties in the application.

Get to know the action form classes.  This holds the data that you pull for
the JSP into the final html delivered to the client.

Know a bit about state management either via the session, request, or in the
query string or aka getParameter.

Hope this helps.

Regards,
Bob Kranson

Download it, and look at some of the example applications that come with
it.  Use tomcat to deploy the sample applications.

If you really have the energy and the drive, I would highly recommend
looking at Matt Raible's Equinox project.  It is a great starter for not
only learning struts, but some other useful open source tools as well.

I hope that this helps.

Thanks
Carlus