I try to do as I would think my Owner would like me to do in those situations where he doesnt have any standing orders to help show me the way.
If I need further clarification of something I of course ask him what he would prefer but only if it is absolutely "nessesary". I was also trainned to use common sence first and not be a burden so much as a pleasure to own.
In other words I should know him, his will and his needs as well as he knows me, he shouldnt have to tell me everthing all the time, I shouldnt be lost without his direct presence and I should be quite capable of anticipating his desires in any given situation.
This kind of thing requires time to develop and lots of two way open and honest comunication.
I highly reccomend that you and your dominant make such comunication of paramount importance in your relationship as well if you have not allready done so.