Well after trial and error, I was able to get the workflow for what I want to do. Here is some trees and rocks for the environment course, going for the stylized look over realism. Find it more of challenge when it comes to textures. Everything see was made by except the HDRI 
. I sculpted the trees and rocks and then retopoligized them using the free instant mesh for blender and then baked them to the low poly meshes. Let me know what you think, and if there is any improvement I can do to better myself.
Now finally moving on to the modular buildings 