Right now, I have my own homegrown testing harness/directory structure/support doc strucure/distribution tools for my libraries. However, reading the blog post Write your c
Ricardo Signes is a pretty prolific module author, and he often writes tools to make module creating as easy as possible. His modules are usually pretty up to date and he seems to stick with the most modern approaches to creating a CPAN distribution, so his distributions are probably good examples. He seems to use Dist::Zilla for managing and uploading his distributions.
Check out Module::Starter module which generates useful boilerplate to help with the creation of a modern Perl module.
Write tests! Check out the Perl Quality Assurance Projects page. It's a bit outdated, but it has some great links to quality reading material.
Check out CPANTS, the CPAN Testing Service
After you've read up on the best tools to create modules, get an account on PAUSE, which allows you to manage your distributions on the CPAN.
Join the #perl IRC chat channel on irc.perl.org. Only about half of the discussion is actually about Perl, but a lot of module authors hang out there and you can learn a lot.