There are multiple API SDK Docs floating arround (1.0, 1.1, 2.0) but the higher version docs (the newer SDK functions) are in korean.
However, someone sent me the 2.1.0 offical SDK API Documentation in ENGLISH a few weeks ago when I was asking about a specific command. I cant remember who off the bat or where the link was, but if you need the doc, email me and I will be glad to send it to you.
The programmers here are more than willing to help, although most are still new to it as well and dont really know most of the functions. Those few who know them usually dont have time to answer too many questions.
I also took the "Trial and Error" approch due to lack of examples, and the API is so straight forward that unless you have a special case, its pretty easy to figureout. No cryptic commands, just simple, to the point, API.
The programmers here are more than willing to help, if you give them the time too. You cant expect an instant answer to a question, but if you give it enough time, someone is bound to answer. Maybe even send a PM to a developer or two and ask personally (but dont send repeated messages, nobody likes a persistant pest)
It is almost a nessesity that you have a solid understanding of programing, and game structure, as well as some experiance in this field. C/C++ skills dont hurt either! If you havent gotten this far, I suggest doing some PC games/apps to get a basic understanding before attempting to tackle this.