There's a lot of information on the
main SAAFE site which could still help you even though it's technically aimed at individual sex workers - it should be easy to translate a lot of it to couples work, such as advertising, booking, confirmation and screening procedures, safety, etc. Of course there'll be the two of you so you won't need to worry so much about additional security, but yes, much of the other stuff is the same.
You can also
search this forum for queries such as, "advertising", "outcalls", "incalls", "condoms", "sponges", and pretty much anything else you can think of. We've discussed just about everything at least once!
If you have any further specific questions after all that reading, please do come back here and let us know.
Oh, and I'm sure anyone who's had experience selling a voyeur experience as a couple will comment here, too.