Needing advice about how I can spice it up

I think my husband is bi and I am a very vanilla in bed. He is usually the dominate take charge one. He wants to try pegging and I’m not against it. I will not be willing to invite another person into our bed, that being said I need all the help,advice and tips you can give me. He wants me to be dominate and I’m not even sure where to begin with being dominate and pegging.