G'day strawberryperls4ever,

Welcome to the Monastery.

Strawberry Perl (SP) comes with all the tools you need to install CPAN modules. My preference for performing the actual installation is the core cpan utility; others prefer cpanm or cpanp (if you want to use one of these, I believe SP comes with one or both of them; if not, you can install using cpan which you'll automatically have). SP should have other tools, such as a compiler, that you may need.

Certain modules require 3rd-party libraries. You may need to install these. The README or INSTALL files, for individual modules, should specify such requirements.

Specifically for Win32API::MIDI, do note the Overview has:

"This module is still under development. Interface may be changed to improve usability.".

It also appears to be abandonware (last update in 2003) so don't hold your breath for movement from "under development" to "stable, production version". This may affect your choice to use this module.

Also note that capitalisation matters: the name is Win32API::MIDI, not WIN32API::MIDI.