The answer for us is quite simple, having developed a good working relationship over the years we have got to the point where we can sit down, set out a coffee and maybe a cake and in meditation using psychic gifts we greet our particular La Madama Spirit, and then ask her questions.
If we need a quicker answer, we might light candles and get the playing cards out and ask La Madama (I hope you can understand that it's not appropriate to use her actual name in public) and typically we will either use simple "red = yes" and "black = no" or if there is time we will perform a spiritual reading.
If you are blessed by having a La Madama Spirit in your Spiritual Court they are very responsive, personally we honour our Madama with gifts of candles or coffee, maybe fresh baked goods as a thanks for her Patronage. We are very careful not to treat her like a Haitian Lwa, as she has stated that she isn't one and doesn't want to be treated like one. However, each person finds the right balance in every relationship and so we encourage you to spend time to get to know your Madama. That is the best way to learn to communicate with her.