There are no "official" rules governing the morals and ethics of psychics and psychic practices. What might be ethical for one person will not necessarily be ethical to another person, so the guidelines become more personal to each reader and readee.
For example, if you don't expect to pay $1000's for a spell for yourself, then others cannot be expected to pay that price. Otherwise it becomes extortion and may be considered as "unethical practice".
Further content pending...