Ok one in English

Take a well looking Terrain Bitmap (Size 1024*1024 or 512*512). Apply this Bitmap to ure Terrain,if u made this, go into the Skin Editor , Select all Faces from Terrain,Scale the Terrain Size in the Skin Editor with the "Scale Button" on the Bottom Left...
Scale so long to it looks good

Save the Terrain and have Fun

Hope this is good enough and u can understand this Text

cYa Sebastian

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