you cant make any custom maps for black ops 2 only modify the current ones waw and mw3 you can make custom maps
mw3 you need cod 4 and use cod 4 radiant
for waw you need waw radient / mod tools
@SakUS What problem are you getting exactly? What export settings do you have?
Reticles have to be square images, DXT1 compression with Mipmaps, the image should not have transparency, use a black background.