Just for your information, I paint abstract art with Photoshop.  I've used up to 60 layers in one painting.   For me the brushes are important, but not many use PS as I do.    I've recently changed my style from the one in my ARTWITHIN gallery.  It appears you want to go in a different direction with your art, so I think it is good to get as many tips and tricks as possible, even if you don't use them all.  You may apply on effect on one layer then a different one on another layer, but when you composite the layers, you can get a completely different look.

Photoshop is a complex program that deserves putting attention into to learn to use it to it maximum benefit if you are interested.  Sometimes, it is worth the money to buy a book you see that gives you step by step instruction on what you want to accomplish.  Take a look at the books available on Amazon, just to get an idea of what is out there.  Someday, you may want to buy a book, even with tutorials on the net, some books are works of art teaching how to create works of art.