This may help you with building your own world for a game- it is not "specific" in many ways because it is not meant to tell you exactly how to do anything, rather it may give you your own ideas based on it.
https://www.deviantart.com/griswaldterrastone/gallery/78188538/how-to-build-your-own-world-series
557 views here. THAT'S THE FREAKING POINT I MAKE WITH THE AMNESTY POST, YOU TELLING ME 557 PEOPLE EVEN IF PEOPLE VIEWD IT FIVE TIMES THAT'S STILL MORE THAN 100 VIEWED THIS AND NOBODY USED ANYTHING FROM THE LINK? But not one thanks.