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| think i am going to download these programs too guys and give this whole world building thing a try |
The quickest and easiest program to find and use is Terragen. That's what Cymro looks to be using. Like most programs, you can just hit the "generate landscape" button and it'll do that for you. You can raise or lower the land in Terragen, texture the landscape with snow or grass, put water in (the best water fx is Terragen, imo) and place and resize the lightsoure (sun). But Terragen won't allow you to create other objects if I recall. So you won't be able to add in planets or moons. Unless you use Photoshop, but that get's tricky when you want clouds in to establish depth.
But, as I said, it's quick and easy to find and use. It's freeware. If you have a file sharing program, I'd just go find Bryce or Vue. More freedom there.