Hi Sebastian, it sounds like you've got it figured out now - please let me know if you still need help with it.
There isn't any regular documentation for it yet - basically I will do the full documentation at the end of the beta period and not right in the middle of it because there is too much of a chance that things could change due to feedback during the beta and I would need to redo the documentation over and over again.
There are some demos and discussion of Flow on the forum here:
