The perlobj(1) man page is a good place to start, and then you can check out the excellent perlbot(1) man page written by the dean of perl o-o himself, Dean Roehrich. Areas covered include the following:
Idx Subsections in perlobj.1 Lines 1 NAME 2 2 DESCRIPTION 16 3 An Object is Simply a Reference 60 4 A Class is Simply a Package 31 5 A Method is Simply a Subroutine 34 6 Method Invocation 75 7 Destructors 14 8 Summary 7 Idx Subsections in perlbot.1 Lines 1 NAME 2 2 INTRODUCTION 9 3 Instance Variables 43 4 Scalar Instance Variables 21 5 Instance Variable Inheritance 35 6 Object Relationships 33 7 Overriding Superclass Methods 49 8 Using Relationship with Sdbm 45 9 Thinking of Code Reuse 111
The section on instance variables should prove very helpful to those wondering how to get data inheritance in perl.
Other resources at this site: