I'm afraid you'll need to provide more information. An array of arrays, an array of hashes, a hash of arrays, a hash of hashes, or any arbitrarily complex datastructure can be created all using references. But the datastructure should probably be a natural extension of the data you're working with, and I'm afraid you haven't told us what exactly that is going to be.

But we can provide you some good startingpoints. Start with perlreftut (tutorial on Perl references), and perlref (in depth explanation of Perl references). Then move on to reading perldsc (the Perl Datastructure Cookbook) and perllol (Perl lists of lists discussion). Those documents will prepare you for making an informed decision on what datastructures to use, and how to manipulate them.