Chromatic's book teaches the modern way of doing it. Damien's book teaches the primary methods used prior to Moose and Moo. Learning both is useful.
These books will teach you how to implement object oriented programming in Perl, but learning the principles of object oriented programming is sort of another step in the process. Eventually you'll probably also want to pick up and study OO design at a higher level, not specific to just Perl. Then bring back those principles to your Perl programming.
