I know it's been said lots before but How to be a good Dom as told by a Sub
Consent is mandatory.
Respect them in all aspects. Respect their sexuality, respect their kinks, respect their boundaries.
If they use their safe word, STOP IMMEDIATELY even if you want to keep going.
They are an individual. They have their own thoughts. Listen to them whenever they talk and respect their opinions. Do not try to absorb them into you.
Always do aftercare. No matter what.
This is a two way street.