I just joined the site and am looking to for some tutorials on how to create some realistic, professional looking geography for maps. I have my own techniques that I've been using for a while now but I want to expand upon what I already know with fresh techniques that other people have discovered.

Software I use currently use is Photoshop CS6. I've got a project that I'm currently working on that I'm trying to speed up in completion.

The problem I've been having on the site, so far, is trying to find the information for the things that I want to polish up on. Since I use Photoshop CS6, I really need geography tutorials on these things specifically: forests, mountains, hills, rivers, grass, etc. The typical geography you might see on a map.

Any help would be grateful in pointing me in the right direction.