If you have a module that you think others might find useful, consider making the world a better place by uploading it to CPAN. The server that handles new module submissions is called PAUSE (the Perl Authors Upload Server) and can be found at https://pause.kbx.de/pause/. Before you can upload your module, you'll have to get a PAUSE account. This is about as close as you can get to being a "registered Perl developer".
If you call yourself a registered Perl developer, you should know enough to document your modules. Perl has a convention of embedding documentation inside your source code. (That way, you never lose it.) This embedded documentation is in a format called "pod" (for Plain Old Documentation) and is described in Chapter 26.
You should consider making your module thread safe. See Chapter 17.
You should also worry a little bit about whether your cute little module does things that could break the security of people who use it, because other folks may have some Really Good Reasons to be more concerned about security than you are (yet). See Chapter 23, for all about how to avoid being responsible for the outbreak of World War III and other such nuisances.
Modules meant to be distributed on CPAN should include a Perl program named Makefile.PL that, when run, generates a Makefile, and a README file briefly explaining what the module is and how to install it. The Makefile will expect your module to include a test suite as well. You can create all these files ...