I love the creation process. I built my first game, a platform game back in the early nineties on the old GameMaker software. I write books, music, songs, build guitars and games. I work with 3d RAD, Open FX and Ultimate Unwrap.
This video uses software to quickly and easily make a 3D mesh - Terrain and then install it in 3D RAD. List of software and explanations of work done.
Just unzip it to your C drive. Make sure you have the dependencies 3D RAD needs. It should play with no trouble.