Thanks for the link to modulinos in the book 'Mastering Perl'. It looks like a really good book and this was just was I was looking for. After reading about it I realized I need to work through the basics of modules and testing modules as described in the book 'Testing Perl'.

Using the example in the first chapter of Testing Perl I was able to make a simple module with a few functions and a test file. It turned out to be simpler to set up than Ruby was.