Importantly, you should start keeping track of your ideas and progress in a research journal right away. A good way to do that is to have it on a web page that you keep expanding. It is useful for you to organize your thoughts and stay on course, and to go back to verify details. Often we will use your latest entries in the journal as the starting point for the meeting---you can also explicitly write down the meeting agenda there.
Typically we will have lots of interaction early on in your career here, at least until your proposal. Gradually you will gain more knowledge and momentum and eventually become more of an expert in your area than me. From there on I'll pretty much try to stay off your back (somewhat unsuccessfully, most of the time :-) and let you do your own work, at least when things are going well.