SAHM and Tradwife are two different things OP. Tradwives choose to be subservient to their husbands, and allow the men to control what the family does, how money is spent, children are schooled, how the home is kept etc.
My advice would be:
Ensure you have a joint bank account and equal access to money coming in, with pension and NI contributions kept up to date and access to savings.
Ensure your husband is 100% on board with the idea that caring for a home and children is a full time job and in no way makes you a second class citizen in the marriage who should defer to him.
Ensure he doesn't think money coming in is 'his' because he earns it, if you have mutually agreed that you'd prefer to have one parent stay home and raise the family than have two incomes and spend one on paying outsiders to raise your children and clean your home.
Ensure he knows exactly how much it would cost to pay someone else to do what you have agreed to do, and that he values your input financially as well as for the wellbeing of your family.
Ensure he understands that raising children and managing the home may be a full time job but that doesn't mean it is 24/7. If he gets a couple of evenings off a week to see friends/go to the gym/ weekends away to watch the rugby etc, you get the exact equivalent and he must be a highly skilled parent, equally capable of managing home and kids in your absence, and not see this as a favour to you.
And do keep an awareness of developments in any industry you have worked in and may want to return to. In a few years, when DC are at school, you may want to return part time or work freelance, so don't cut yourself off entirely.