UE Map Creation Workflow

Can anyone share your workflow of creating UE fantasy map from scratch? What software you use for heightmap, texturing, baking etc…? Where do you get your reference from?

I’m using WM at the moment, and its texturing looks fine to me. Do I take it into UE then paint on top of it or something? Would be great if you can share me some tips!

You have my eternal gratitude! Many thanks in advanced!!!