Did you do a google search to find some basic tutorials on Struts. I would recommend that you get a book and learn from it. Go for Struts 2, Struts 1 is old and you should start directly with Struts 2...
Our Struts FAQ has pointers to books and tutorials to get you started. As Ankit said, start with Struts 2 if you don't have a good reason for Struts 1 (i.e. you are maintaining a Struts 1 application).