Welcome lizard. I'm always struck by how generous you all are on this thread spending time sharing your advice on how to get started. Lovely. 
Here's my tips:
Spend a good chunk of time reading Martin Lewis's articles on Money Saving Expert. It's an education and understand money and how financial services work gives you a bit more power! He makes a lot of the maths/logic clear and what to prioritise if you're in debt.
Use cash and pots. Spending with notes and coins is more real than cards and online. You can easily shift cash between pots and see how you're doing day-to-day. E.g. we have pots for groceries, parking, eating out/takeaway and outings (playgroup, activities, etc). Each month I put cash into each pot and when it's gone, it's gone, or I have to draw on another pot.
There's often threads where people discuss the management of joint finances so you can browse those if it helps. We split the childcare so DP enables me to work and I enable him, but I earn a lot more so we've had to come up with a system that means we contribute equally (in proportion to our income) and have some independence. I think when you have children, it's not "his money" or "my money", it's ours (including the children) with us two, hopefully, being the responsible guardians of the family finances.
Right. Off to buy nappies online (expensive guilt-reducing biodegradable ones...) and do some more work. While eating lots of chocolate! Happy Easter all.
