We discovered that the fewer the rules, the easier and calmer life was. So if you are going to make hard and fast rules, make just a few REALLY good ones that you are happy to reinforce every single time.
We only had one. It was 'Be kind'
That encompassed tidying up (kind to me), sharing (kind to each other), being gentle with the dogs etc. if you think about what you want to achieve, so much of it fits in this category. I am married to the worlds kindest man and I try to live this way myself, to model behaviour as well as having it as a rule.
Some things are obviously outside this but still necessary (healthy food, teeth cleaning) and I didn't see those as rules, so much as 'that's just the way we do things'
We had two "No hitting" and "Use kind words" and they seemed to be enough. Youngest dd had her own rule that she came up with that she thought was the best one and that was "Always obey signs and Mummy"