Create a Script an wirte these Lines of Code in it...

Code:


Function Main
{
   load_level("Your_Level_Name.wmb"); // insert here your Levelname
}


Attach this Script to your Level... Open The WED -> File -> Map Properties -> use the "Folder Button" to open your Script"

Tutorials:
[Blender]Terrain creation ENG/GER
[Blender]Low Poly Tree Modeling
[GIMP]Create a Texture for Terrains
CLICK HERE