How to set/change variables from an Editor Window on a Prefab

Hey Guys, I want create an Editor Window on which I have some fields which I can fill in. If a Submit Button is pressed a new GameObject gets created some Script get attached and now I want to set the filled in settings on the script how would I do that ? So that after this is set I save it as a Prefab in the Ressource Folder and can use it later on.

I just need some examples in c# for a bool or string since this should be the same for all kind of types.

Would be cool if someone could share a little code segmant which showcase how to do this.

Kind Regards, StonedLover