I've made a GUI for a plot changing system. But how do I script it?

I've made a GUI for a plot changing system. But how do I script it? I've worked on a GUI for a plot changing system, but since im terrible at scripting I dont know how to script it. If you would be able to provide like a kit or code to help that would be great but if not you can keep scrolling to other questions. Thanks for reading this and bye. Heres the UI if you want to see. https://www.roblox.com/games/5890201724/Test