I need to know how to initiate a "Dom/Sub" relationship.?

She is a bit more experience with it. I am new to it. She is a Sub and is very dedicated to it. We have only talked in person once. We plan to continue things. What is an appropriate timeline or series of events to start a relationship like this? When does the actual Dom/Sub activity start? And what are the normal activities leading up to it? Tell me anything you can to help me.