Why the use 5.008008? If you want your module to be widely used, you'll need to support more than just the latest Perl version. As to how ancient a Perl version you support, that is something of a black art, depending on the type of module, its typical users, ... and how much pain you can stand. ;-)

For some general advice on writing CPAN modules, see:

• How to make a CPAN Module Distribution
• Simple Module Tutorial
• José's Guide for creating Perl modules
• Writing Solid CPAN Modules
• Writing Perl Modules for CPAN, book by Sam Tregar (free download)

Before you uploaded your first CPAN module, you should have chosen a module name and sketched out its interface, then posted it here or on the module-authors@perl.org mailing list, requesting feedback. Had you done that, someone would have doubtless mentioned Acme::Comment, and you may have chosen not to write your module at all.

Also, it is vital to focus on interface early and to strive to get it right first time, because once your module is released into the wild, any change you make to its interface will break your existing users' code (anything else can be easily fixed in later releases). For some general advice on how to design an interface, see On Interfaces and APIs.