you're looking at Aristotls's post, but you aren't reading his words.

try reading the perldocs for require, import, and use, and then maybe you'll have a better understanding of what he's saying.

As a hint: you most definitely, absolutely, do NOT want a BEGIN block if you aren't going to know the full Module untill run time. (a close inspection of the "Package Constructors and Destructors" section of the perldoc perlmod should help you see why)