It sounds like the problem is not so much how to use OO in Perl but more how to use OO in a general sense. Most of the Perl OO books and reference materials (with the exception of the perlboot manpage) assume you already know all about OO design, and thus are not very helpful to beginners.

To learn the theory of effective OO programming, you will have to read non-Perl books. A lot of introductory texts are written using Java for examples these days, and some try to be language-independent. I suggest you head to your local tech book store and browse the introductory OO books until you find one with a tone that you like.