Our bank account is joint, we have a bills and savings account linked to our everyday, I find it much easier tracking money when it is coming in and going out one account, it also makes us more conscience on what we are spending out money on as we can both see where it goes.
Before anything else is paid 10% of earnings is put straight into our savings account. Then rent is paid. I have a budget app on my phone and have bills/expenses sorted into weekly, monthly, quarterly, yearly columns and an allocated amount for each expense gets put in it.
What is left in our bank account is "play money" some weeks there is more left then others. DF works alot of shift work and is on call quite a fair bit so it varies, we can't work off the same weekly/monthly budget.
It was hard in the beginning, we both had bad money issues and alot of money was being wasted, and losing money in fees, overdrawns etc. I actually relied on my parents help for the first couple of months, giving my money over to my parents for them to hold and when we had a decent amount saved transferred it to our saving account. Once that number was decent it was easy to keep adding, now we hate having to dig into it!
I should also add, before all of this, DF consolidating his previous debts, I paid off a credit card and got rid of it, we were stuck in a bit of a rut before doing this because DF's debts alone were taking most of his wage, by the time he paid the minimum, interest would get slapped on and practically put the balance back where it was. We had no sense of money or budgeting, sometimes it can be hard starting good money habits, especially if you are behind in the first place, so don't hesitate asking for help for a budget planner/consolidator etc. If you think that's the boost you need