Here is a link to a YouTube channel you may already know that I think you would find useful.
Word of warning however. In the game design industry, there aren't any "ideas persons" with the sole job of creating ideas. New ideas just come from anyone in the development team. If your focus is on script writing for video games, start by branching off into other mediums first. Just things like novels or movie scripts as well as game story lines. This means you will be more experienced in the writing process. If you don't plan on writing, I highly recommend learning programming, 3D modeling, music, or something else that will make you a valuable employee coming into the industry.
Pretty much, from my knowledge, the design of a game comes from the people who make the actual game. They don't have a dedicated team for ideas, so I recommend learning a development skill.