If you are just starting with OO programming in Perl then it's certainly good to see the non-Moose, old style first and understand it but then move on to a more modern object system like Moose.

I think that's backwards, especially if you've not done OO before. Perl 5's default OO system exposes so much plumbing it's easy to get lost in the syntactic details of how to do things instead of understanding well what to do and why to do it.

That's kind of like suggesting that you make your own pie crust by hand before you can ever put toppings on a bake at home pizza.