Don't have the attitude of "what are some secret tips" or anything. Remember, the point of the cabals is to imcrease your roleplaying, to flesh it out a bit.
So I'd say, think up of an RP reason. Now, you're trying to be a Knight. Is your reason just so you can eradicate all the evil in the land? What if a neutral comes up to you and wants to talk to you about your reasons? Would you be able to defend yourself? Etc. etc. Why do you want to be a Knight? Do you believe that you can accomplish your goals more solely by being a Knight? What would you do if you decided to talk to William? How would you speak to him? What would you say?
I guess the point is, remember, this shouldn't really be something like secret tips for the SATs. Remember that the Knight cabal shouldn't be your final goal, but only something that improves your ability to accomplish it.