Counter Strike Map to create is very easy... If u want the Grafik like CS1.6, a Map would be build in maybe 4-5 Hours...
I Think u can ge inspirations form differnt maps und build ure own with this inspiration...

cYa Sebastian


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