If you have a graphical environment, like ActiveState's Komodo, then that answers your question. That, of course, is pay software.

If not, start by entering perl -D on the command line to determine if you have a full debugging version of perl. This is not the default install as it is slower and more of a memory hog. You should be able to do limited text-interface debugging without a recompile using the -d flag with the regular version. Given the complexity associated with any debugging interface, I would direct you to perldoc for more info.