Perl related query

Hello All, I am making another start at learning Perl, and I am looking at installing the -doc module. I do have cpan to do the install, but trying to sort out exactly what the -doc package should be called for the install with cpan. Having the correct argument for cpan would help, but I am also wanting to understand what I need to look for in sorting out the naming conventions for the modules, and how to look up such. Regards Mark Trickett