I just wanted to emphasize that recommendation for "The Perl Cookbook": you'll certainly want some sort of tutorial ("Learning Perl" or one of it's competitors), but the "Cookbook" needs to be high on the list right after that, possibly even before the Camel itself. You're in a position where you need to get productive quickly, and the "Cookbook" is ideal for that -- it is not, by the way, just a canned list of recipies, each recipie comes with a short article explaining what's going on: perfect for learning as you go.

"Best Practices" is a good book also, though myself I find that I have at least minor disagreements with quite a few of it's recommendations (perhaps as much as 20%).

Also, the perl online documentation is generally pretty good and includes a number of "tutorial" articles on different subjects. On a unix box try a "man perl", that brings up a directory of the different man pages, with a section on "tutorials" right near the top.