There have alot of the human clans show you how not to pk in Knight. Even only 3 or 4 really good dcz clans on human side and you gotta be top of your class to get into them. Such as a perfect example will be go to bdw and have a look at your average human party. From pk vids it can give you an idea of how to play your class because eg Viktor PK movie isone of the best bps on the server.
Then you can know that bp is pretty worthless on buff or heal if your going for pk id strongly suggest duff/heal or heal/duff because without atleast malice you will not get a kill not unless your oponent is a complete nub anway o0 also alot of human run on scrolls in dcz so rfom that point of view buff again are not really needed that much unless its for yourself but then you can go to intel priest this game(knight online gold).
Good human dcz clans to get into are Hostile, Amorak, Rebel, AntiBabashoppers and FirstTarget. They are the top 5 human dcz clans and will be most beneficial to you. Thebest thing to do is pm thier leader when you see them and make sure they will test you out and tell you what your doing wrong and how to do those bits better. If he is a very good guys and great fun to pk with an against. Use our Knight powerleveling will make the game more interesting.