Speak with Farseer Nobundo at the Crystal Hall in the Exodar.
I am thankful that you have chosen the difficult path of the shaman. Few enough do, but I foresee it as critical to our future that we learn shamanism from the Broken.
They are called that, but once they were draenei. Fel magics transformed them, and that is why they cannot call upon the power of the Light. Some disapprove of them and the shamanism they teach, but they are not evil.
I wish you to speak with Farseer Nobundo. He is the wisest shaman I know and you will learn much with his guidance.