you are asking a very general question. You need to start working on the idea and you will have a prototype. If everything works the way you need it to, you’ll go into production.
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Depends on what you’re asking, if you mean “what do I need to see if I can make this game in Godot” then you need to figure out your game mechanics and implement them, if you mean “what do I need to include in a prototype to show off my project” then that depends on what you want to convey, if you mean “what do I need to add to a test demo to see if it works in testing” that depends on your project
So first question is:
What do you mean by a “prototype”