Infinite terrain

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Moraldi

Hi guys!
I want to make an infinite (or at least a very large terrain) where I can drive my spaceship at a very low height. I want to place structures in certain positions. Before try to reinvent the wheel can someone give me guidelines on:
1. How to create infinite terrains.
2. How to place my structures on the terrain above. (is there any good program for this?)

Thanks in advance.