Gamedev stepbystep

[iyenal]

Sorry if I looked not very polite, didn't wanted that.
It's just that if you first really wanted to do a game like this, you wouldn't even ask on a forum like now.

You don't do an AAA game by snapping your fingers.
It comes from experience, a lot of people, substantial time and money investment, knowledge on many domains... you can't have all of that yourself alone.