Hey,
Sometimes the wrong settings generate the best results.
I started out with Terragen again after a few years break.
I used to experiment with TG1 in the past and with Bryce 4, but they were too slow for my computer/liking then.
Having to wait for over 24 hours for an 800x600 picture was beyond my level of patience.
Start off with basic textures and experiment with skies and how making rocks and all that works and what the settings do. I liked all the free files in the shares of this forum. They are great to start out with and the tutorials are cool as well.
Don't turn the rendersettings too high at first.
Making layered textures is still hard for me and I probably don't know what I am doing half of the time, but I get interesting results for now.
Remember to save your TGD files for comparison. And maybe you found some cool effect that you want to use later.
TG is fairly difficult, but we will get there in the end. I'm not into animations because I don't have my own renderfactory like Disney and the free version doesn't do animations.
Here are some of my initial experiments (from right to left and up to down in chronological order)
I noticed that my FB friends liked the mistakes more than the good versions sometimes

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