The scripting language is C# (
http://en.wikipedia.org/wiki/C_Sharp...ng_language%29), so you must use the syntax of this programming language.
In directory ...\SteamApps\common\il-2 sturmovik cliffs of dover\parts\core you find several dlls: maddox.dll, gameworld.dll ...
Then you need for example Visual Studio (Express).
Make a c# project then link the gameworld.dll to the project, for example.
After this you can look at the objects, methods and variables with the Object Explorer of Visual Studio (for mission scripting look at the class AMission).
And now try and error
.
Examples for Mission scripting you will find in the campaign directories (...\SteamApps\common\il-2 sturmovik cliffs of dover\parts\bob\mission\campaign).
Hope in future there will be a detailed documentation by the developer.