I usually recommend Learning Perl, and Intermediate Perl. Those two, combined with some of the POD, will get you most of what you need to be able to take some existing programming skills and apply them toward making yourself useful with Perl.

POD (Plain Old Documentation) that ships with Perl, that I recommend as starting points include:

• perlintro
• perlsyn
• perlsub
• perlvar
• A few of the tutorials