I know, alot of people know how to do this, but some people dont, and alot of the new people wanting to make maps, like we all where once, wont know how to do this.
Heres the only link to it for now, im hoping to upload to some other places soon: Custom Scenery Tutorial By FireDragon 04
Note: Im sorry if my voice is to quite, just turn up your speakers
My desktop is kinda in a mess as u can see once or twice in the video, but i like it that way. And yes i am English 
Oh and the movie is just over 10mins long, its longer than i wanted because tool took a while and sapien felt like it took a lifetime
But o well sapien does that alot to me