BDSM advice needed!

My husband and I started experimenting with bondage and light BDSM type foreplay and sex. Every once in awhile I tell him what to do, but generally he ties me up and gives me orders and I love it. He recently expressed to me that he wants me to be his master for the evening. We have a 15 month old, luckily she is a good sleeper, but we have a ski trip planned just the two of us next week so we plan to experiment more then. Anyway, any advice when being the dom? What are things you've said or done that your partner likes?

We have a safe word, but have never used it. We like to push boundaries.