Great data structures for what must be a wonderful language     ...   I think?

But have you written the language yet? If so, what's it called and where can we read about it?

To progress with Perl, you really need to read a primary text ("Learning Perl" leaps to mind) because, as a wise person once said, 'You can't just make stuff up and expect the computer to understand.'

And, as various Monks have observed, it's well to acknowledge the fact when you're asking for help with homework.