Liz already pointed you out to my "Where and how" node. A lot of good tutorials can be found here at Perl Monks.
in reply to Introductory books about Perl and mod_perl
Before you, several people have asked for the best place or the best way to start learning Perl and others have answered: here, here, here and here.
With regards to mod_perl, you'd best go to the source, which is http://perl.apache.org.
Or use (one of) these books:
Practical Mod_perl by Stas Bekman, Eric Cholet
( Chapter 6: Coding with mod_perl in Mind can be read online).
mod_perl Developer's Cookbook by Geoffrey Young, Paul Lindner, Randy Kobes
( 3 introductions and chapters 1, 3, 4, 7, 13, 16, Appendix B can be read online).
A bit of search in the Monks or a Google search sweep lists dozens of interesting places. Take your pick.