I started with the environment by using the paint deformation tool in 3ds max to create my terrain.
Afterwards I focused on the plants and rocks.

From Quixel Megascan I used several image atlases for the plants as well as 3d rock models.
I created some rocks and plants myself to complete my collection for the desert environment.

I started to place the items in the environment and I left some empty spots at the bottom of the mountain where the cabins will be placed, surrounded by rocks.