game-editor.com

how to work with a game editor?

is there any help document available

Yes, there is. when using GE press the help thing thats next to file and all that good stuff, and you will see stuff that says, Demo making of, actions and events, and a bunch of other stuff click on those and it will show more stuff click on those and it will start a tutorial. or click on help and then click on documentary.

p.s. makslane would explain this way simpler.

Take a look at the Moon Defender tutorial:
http://game-editor.com/tutorials/moonde ... l_eng.html