I'd recommend not focusing on Blender/Blender2Crystal to begin with,
but first learn the basics of CS by checking the tutorials in the manual (yes, even if they're in C++
then look at the python examples in CS/scripts/python/
. Those are straightforward conversions of classical CS C++ code to Python.
Then you could look more closely at CEL, as see what it can do for you (ie. understand how much code it can save you from writing yourself).
Finally, you could see how Blender2Crystal can be used to leverage CS & CEL, but for a game like that, it may be faster to code stuff directly,
since there are no predefined quests or templates from games like that.
Or maybe you could jump directly at writing those quests and templates, and use them directly from Blender & Blender2Crystal.
Come in IRC #crystalspace @chat.freenode.net one of these days, and either nag caedes about that,
and eventually garou too, who made a "Go" game using celstart some time ago...