The post is a mess in my opinion, its not clear what you want and what do you ask about. Do you really understand what game design is about? It is pretty damn tough job by itself, you need years of experience in general game development to become a game designer.
You need to start somewhere else. Become Unity engine scripter. Fairly easy to learn, a lot of jobs you can do in your free time. Or become 3d modeller. Get into the industry and some time later you might start thinking about game designer.