We've been together for 8 years, co-habiting for 7 years, and married for just over 2. (We also bought a house before marriage.) Our situation has evolved over that time, and we finally fully combined finances about 8 months ago. Our incomes have almost always been even (within a few hundred dollars) so we just split everything 50/50 - bills, groceries, down payment. I've nudged my spouse on things like retirement contributions, savings goals, things like that. We recently combined everything because there are some big changes coming our way (making humans, a career change) and I wanted to get the rough spots of combining finances ironed out now instead of when life got turned upside down and stressful. Like preventative financial maintenance, I guess.
Best advice I can give is talk about it early and often. Right now we have one joint checking/savings account (for household expenses, travel, pet care, etc), and separate checking/savings account for personal fun money. We talked about what we wanted to be funded from the joint account v. personal account (though there is flexibility.) I manage the accounts, and I usually mention how our financial house is doing over weekend breakfast. It can spark some good discussions and keeps my spouse in the loop, whether he wants to be or not.
I'm a big advocate of shared financial goals, but how you work the accounts and nitty gritty is 100% flexible. In 8 years, we've never had an argument about money. I honestly don't think we ever will. Do what works for you, and understand that what works this year might not work 10 years from now.