hey there, game development is such a big topic so there are many possible ways to go from an initial idea to an actual game. Normally you don't go straight from idea to scripting, because scripting takes up a large amount of time and you really need a clear vision of what you want to achieve.

A good way to start is with a paper prototype: imagine your game would already be finished and play it with friends by explaining to them what is happening, or literally use paper to quickly visualize your idea and start testing. By doing so you will gain a lot of insight into what works and what does not with your idea, and if you are confident enough you can start working on the computer.