I have to agree with everyone as far as the communication levels go. Communication should never stop. In the beginning you are discovering a whole new realm of things such as, some that you have heard of, and others that you have never heard of but sort of are inclined at doing. Or sounds interesting.
Now let me tell you, from my point of view. My slave and I have talked about fantasies. Some of her fantasies, and mine have blown each other away. Some are not even possible but sound terribly erotic. There is nothing to say that you can't act out a particular fantasy, but in a different way in order to make it safe and sane, and even possible in a different scenario. Thats where all the communication comes in.
Communicate about everything, from lets say, particular things that either one of you would like to start see happening, then you can even make a pros and cons list of each one. It is a process, but certainly worth doing to make the relationship work. For example, you may want to start a ritual on a daily basis. But, this ritual, lets say having your sub/slave kneeling by the door naked when you are arrive home, but may not be feasible. What you need to do is work around certain things, and make it possible.
That is the worst thing I see in the lifestyle is where couples in a D/s relationship stop communicating things. Things get stale, yes even in BDSM. Re-evaluate your needs, wants, desires, limits, etc. I would say every 6 months to a year, so limits can be worked on, or worked up, (if it is a workable limit, and not a hard limit). OK, I have said too much as usual. Good luck, and please, if you have questions, ask away!
Jay