[RMVX ACE] HOW TO MAKE A NEW MENU OPTION

For my RPG, I want to have a new menu option that updates based on what actors are in the main party, that lets the user select and view a brief overview of how each actor is meant to be played.
To do this, I have been searching for a script that lets the developer add their own custom menu options/dialogues. Would anybody either have a reasonable idea of how to do this, or a script to do so?

@kory_boombs I've got that script installed already, and for what I need to do common events just don't cut it, and I don't know how to program my own menu from scratch (ergo I can't put it in under 'custom commands')