Knighters (Ian?) as far as I know, you are correct in that all you need to know in unity is creating a terrain, manipulating that terrain and also how to import and apply textures. The skybox has changed in unity5 so I wouldn't get too hung up on that. I haven't got courseforge so I can't comment anymore on that but it sounds like you are on the right track. There are more advanced bits like the trees and grasses but that's for another day!
Cheers
Bruce
Thanks Brucey,
I will learn the extra bits after I have picked up the basics. I haven't downloaded Unity 5 yet, I'm learning on an earlier version.
Ian