Komodo Edit is not an IDE. There are plenty of free editors around, but very few nice free IDEs that integrate well with Perl. The advantage to a beginner of an IDE (as opposed to a nice editor) is almost all in the integrated debugging - mouse over tool tips for variable contents for example. That sort of stuff can really facilitate understanding of things like references and nested data structures (AOA, AOH, HOA, ...).
DWIM is Perl's answer to Gödel