Level editor and Quest creation

[Colt98 0]

Hello
Sorry for my bad english:P

I want to make a mod with new locations and new quests for Clear sky but i dont know how to use Level editor and how to make a quests. I tried to use Russian tutorials but nothing worked. My mods were limited to new textures and sounds, I would like to do something new but i dont know how:P. If someone could show me where to start I would be very grateful .
Thank you in advance