Sorry i just teach psychic, ask lessons for Goddess
But truthfully its impossible to teach someone a class, you have to learn. Not everyone likes the same combo's or same playstyles you have to find this all for yourself but the most important thing above all is to learn how to use your combo's with a stunlock. A bm who cannot stunlock in a 1v1 is no good, and for mass pk just go full vit aoe stun HF more aoes stuns etc once you get the hang of it, its simple. If you want a small guide i put together for mass pk as a bm message me on the forums and ill send you it.
PM VegetaSS for lessons.