Must be legal in my country
Must be within somewhat moral reasoning
Must have my physical, emotional, and mental safety a top concern at all times
Must not waste my time
Must understand that sometimes life happens and things we can't control happen and may interfere with the recording process, delivery time, ability to perform/produce specific requests or to complete content, etc. You work with me, I'll work with you!
Expected to be respectful and professional
Provide every explicit detail for what you want, you are paying for it after all, always have multiple options that can be substituted if one option is not doable for whatever reason. Be realistic. Just be nice and polite! (Yes, I'm 420 friendly!