greenhorn-uk

I own the Easyfly flight simulator and would like to be able to create a landscape of my local flying site which consists of a flat field, mown strip and is bounded by walls on three sides (then roads) and trees on the fourth. I have managed to edit some of the features on the standard landscape by removing the "hanger" and prisms at the side of the runway. Can anybody give some advice or links to sites that explain how to go about creating a landscape?

Thanks.[8D]