Wild West desert enviroment

i am working on a game about the wild west and need a open world (large) desert enviroment similar to that of red dead redemption. If someone can, i would appreciate if you could make one. here is a photo of what im looking for https://www.rockstargames.com/rockstar_games/games/img/screens/1-1.jpg

I could attempt to do it,but It depends really. I need to know more about it. Thanks