Yes I agree. I had no experience designing and creating games so I started off small, creating games like Tetris, Pong, Chess (without the AI) then I moved onto bigger projects. If you are going to be the designer of this game then make sure that it is a game that you would want to play otherwise your project will fail. You should play other games of the same genre to get a feel for what works and what doesn't.
You idea is a good start but you need to flesh it out with a lot more detail. Once you have a detailed design document then you can start gathering a team to develop it.
Best of luck to you.