Comunication is paramount as is respect and trust.

Adding to August"s and Browneyedgirl" ideas of getting the information train rolling: as a slave myself; Ive found it to be much more exciting than any possible writting assignment when getting to know any given dominant, to be told to kneel face down ass up blindfolded and or bound, perhaps told to hold my cheeks open and be "questioned" in a specific manner by the dominant while he or she fools around with me some, or some other such scenario.

Other than that, plan ahead, be safe, sane and consensual first, and kinky second and you should do fine.