You are rightly worried to feel you may be pushed into feeling you are the less powerful because he is the one earning. On the other hand, he can end up feeling that all anyone at home cares about is his paycheck. That you make all decisions, and only need him for the cash.
In 24 years, we have had every combination of who is at home, who is earning more, and where the money is kept: from separate accounts, division of bills, and allowances to one account, two debit cards and shared password. It depends on life at the time.
If you have always kept your money in separate pots and divided bill payments, this will be a big change. When we first combined expenses, (about 5 years into married life) here is what we did:
Paychecks direct deposited into joint account. Other amounts also deposited into joint, if/when it happens.
Transfer standing orders for electricity, mortgage, etc to joint account. (Watch very carefully the first month! Check daily!)
Standing order for personal allowances to existing individual accounts.
Standing orders for payments to retirement accounts and savings.
After all that, the rest of the funds in the joint account should be grocery, petrol, expenses relating to the kid(s) or family activities. If the ending balance is enough that it starts accumulating, move some to savings/consider raising that order.
You will need to agree what personal allowances are meant to cover.
It does get weird sorting out what is reasonably fair since you are living very different lives during the day, and you are doing things for/with the kids, not because you want that sort of fun. (I mean, . But then again, he doesnt really think of business lunches as fun. Like so many things, you both have to be generous.
Time and money both matter. You also need to decide on downtime for each of you, and for both of you. It is just as important as planning how cash will work. You both need to maintain your personal interests. And, date night. It really matters. Remember what I said about him feeling like a cash machine? He needs time to be himself, to be dad, to be your guy, just as much as you need time to not be mom.
And it all needs to be treated flexibly and adjusted regularly. Small changes at work, school, the grocery store can knock it out of balance.