I've entered into a sissy maid/ mistress relationship. I am looking for pointers and advice on how to enjoy being a dominatrix.
To be honest it's about finding your own path with your partner and exploring together like any relationship, particularly a kinky one. I'd ignore anyone else's predetermined ideas as they don't know you, your partner, and the chemistry and dynamic between you. It isn't about trying to meet anyone else's ideas of what a Domme should be, particularly as this is often coloured by fantasists.
"Selfish" is a great baseline for dominance, since you'll always know what to do. What turns you on, gets you off?
There are plenty of books and blogs about this but in the end, you really just need to understand the psychology involved and apply it in a way that is comfortable and pleasurable for you.