star a big projet

Where do you start a game so you don't get confused and stay organized?

I would suggest starting with the core mechanic. like the movement in a platformer or whatever the main mechanic is. make it feel as good and easy to use as possible. that way your building your game around the main mechanic instead of building your mechanic around your game.

There should be like a organized place for what you like and other things so you can play them.