The scripting API is huge and it will take a while before everything is documented. So instead of keeping you waiting for a few weeks, here is a work in progress Scripting Reference document. Lots of stuff missing still and probably a few errors in there. I'll be adding more stuff to the page but hopefully this helps at least a bit to get you up to speed.
http://www.grimrock.net/modding/scripting-reference/
Have fun!