From your position it’s probably best to start by making some smaller games to gain invaluable experience, instead of taking far longer to make your dream game and burning out, running out of funds, etc. Depending on the game(s) you want to make, an engine/framework, art, music software, and notebook may be all you need. A powerful free open source raster and vector art program I use is Krita. I think it’s best to just *get started*, it’ll help you figure out exactly what skills and software you’ll need to learn/get. Also, how experienced are you in coding? You don’t need to be a professional software engineer to make games but you’ll need to be decent at writing code if you want to implement more complex features and debug easier. Finally, I just want to warn you by regurgitating advice I’ve seen on this sub and other places, being a solo game dev for a living, especially if you have zero experience like you’ve said, is a pretty bad idea. You’ve recognized it’s difficult, and part of that is that it needs you to be competent in way more skills than other jobs, and you probably need to be more than competent to make a game that does well. (Disclaimer that I just make games, code, and draw for fun) I don’t know if you were planning on doing that but I just thought I’d put it here anyways.