Interesting Spawn and Post Processing volume issues

the problem for me (and its totally my issue) is I do not understand how to setup and work Submaps. Honestly I think I’m in over my head here.
I think I can MAKE the island and the foliage and what not…but I’m going to need help or support to get it ready for prime time.

Maybe when I get to a point that i’m happy with what I’ve built I can ask for a hand.

There are so many things I’m still trying to understand.

Making mountains using height maps.
Making caves
Making Waterfalls (although I think I got this)
Making floating islands.

Because its just me now making a proof of concept for the label…I’m not sure how much of the above I can do on my own with just what the editor provides