Allow ~ Have no expectations. Be open to what comes through. While it's fine to have questions, being open to the answers makes communication easier and clearer. I have witnessed entire hour sessions being taken up be the client's wish to hear a certain belief. I work with "light" and ask that you receive what you need, if you are not ready or supposed to know something, you won't. Mediums do not have special powers, we are simply the messangers. You may absolutely requests who comes through. All spirits have free will, incarnate as well as discarnate.
Take Record ~ I give sessions from my right brain and open heart, and interject from my left and open mind. Meaning; I am fully aware the session is for you and give you much information in a short period. I suggest writing some notes (especially the parts that you do not understand) down during or shortly after. You are bound to forget information that may not have meaning till after the session. Know that once the communication is open, others may want to come through for people you have contact with and can rely a message to.
Be Still ~ Don't schedule anything right before or after your session. Take time to be alone in stillness: meditate, write, take a bath, be in nature, play soothing music. Your awareness often lasts long after the session and begins long before.