Asking where to start with something like this is very involving. It sounds like you want to create an entirely new scene where you present the weapons with the choice of equipping and showing which players can and can not use them. And if not a new scene than severe edits to Scene_Menu/Scene_Equip. This is a very involving task for someone who just asked what variables could hold. Its definitely not something I would suggest, for someone who is new to Ruby/RGSS, to start with. Start small and simple. Reading some beginner tutorials on Ruby/RGSS. Creating a HUD or a Sprite object when you're on the map. Then move into a creating a custom Scene work.
Good luck with it Nathmatt! :thumb: