How to config tomcat4.0 to make my servlets work?

[KINGMAN]

I make a directory in WEBAPPS.I make directory "jsp","servlets" in the directory and 
make directory classses in web-inf. I put my servlets class file in directory 
"servlets" ,When I call it in jsp file,it doesn't work.How can I do?
My beans in directory "classes" can't be found too.

thanks.

                                                                                       
                kingman