For learning, I prefer books which walk you through examples. Laura Lemay wrote a very easy-to-understand book for SAMS entitled: "Teach Yourself Perl in 21 Days." This will give you a good, in-depth, self-paced tutorial. After following her book you'll feel like a pro.

As a reference book, I like the O'Reilly (Camel) book "Programming Perl" by Larry Wall, Tom Christiansen & Jon Orwant.

Best wishes, and welcome to Perl.