I want to make my own cs but I have never used a 3d application. what is the best app for begginners?

Well don't ask me...i don't even know what tool/program i need to create custom scenery...maybe you can help me with that?:?

I have been trying out blender, but it is very hard and it has taken me 5 months to make a very basic tower.

Try Google Sketchup. There are alot of tutorials on YouTube on how to use it.

If you are having trouble with Blender, then search the Wikibook Blender 3D: Noob to Pro

It is very hard though. You will need many hours of experience. But after you get the hang of it its easy.