Thank you to everyone for all of your helpful input! I really appreciate that you have taken me seriously lol
Am I way too ambitious? Yes haha. Every day of my life. Thank you for trying to ground me. I had a good feeling many of you would tell me to start small. I suppose that is inevitable given that they have you start pretty small in many of the Unity tutorials.
I do not intend to be the main developer for the game, because that seems way over my head. I do, however, seek to add value to a partnership or team. I figured knowing more than how to write a business plan or a game design document would be ideal.
Mainly, I was not sure what my first steps should be. Should I write a GDD before making a prototype, or the other way around? As one of you already mentioned, why design a prototype if I'm not testing the feasibility of a specific game mechanic? I recently learned prototypes are meant to answer specific questions you have about how the game will work, not necessarily to show off a potential game. I am not entirely sure where that leaves me, but the first step seems be to get a better understanding of the work that is ahead of me if I decide to commit to undertaking such a project.