Really understand what you want, the specific activities and your limits, hard and soft. You will get so much more out of the session if you can communicate your interests. Don't expect the domme to know. There are hundreds of activities. It's okay to start with a few and grow.

On the other side, do not script your session. This is where we know better. Give your domina what you want to try and then be open for the exciting roller coaster--let yourself go to the experience.