Top tips would be:
Declutter. Kondo is great for this. Cleaning is a million times easier when there's no clutter, and tidying feels overwhelming when nothing has a home and there is random crap bulging out of every drawer and surface.
As far as you can, set things up to be easy to clean. Again, Kondo principles are great for this. As little as possible out on the floor or on work surfaces. Little things like buying storage boxes with lids rather than without, or bookcases with glass doors rather than open-front, help to keep dust off. Have minimal ornaments on display unless they are behind glass doors. Have bedside tables with drawers, rather than keeping things piled up on surfaces. Etcetera.
Invest in labour-saving devices. Tumble dryer, dishwasher, cordless vacuum, mop with disposable pads (this one unfortunately not v environmentally friendly), self-cleaning ("pyrolytic") oven. Drastically cuts down on the work you have to do, and a much lower threshold for things like whipping the vacuum out to hoover up a spill instead of dragging a heavy corded one around.
Have daily, weekly, and monthly or seasonal jobs. Things like dishes, surface-cleaning the kitchen floor and worktops and (for most people) laundry need to be done daily to stay on top of them. Things like giving the bathroom and kitchen a proper clean, the house a proper dust/mop/vacuum, and changing beds and towels need to be done every week. Heavier jobs can usually be done less frequently, and you'll find your own "sweet spot" where things are done often enough to keep you happy but not so often they drive you mad!
Get into a routine and make sure that both you and DH are on-board. Find a routine that works for both of you so that you can work together with goodwill at keeping the house nice for the whole family. Some couples find it easier to have discrete tasks they're responsible for to save arguments, others are more "just see it and do it", and still others operate somewhere in between.
You say your mum used to do everything for you. Don't be ashamed to ask her for advice or basic information. So what if you didn't think to ask her this stuff when you were 18? You're asking now. I consider myself a good and competent housekeeper and have been living away from home for many years, yet I still ask my mum's advice (admittedly mainly cooking-related rather than cleaning) from time to time.
If you can afford it, consider getting a cleaner for a couple of hours a week. It's a cliché but they really are a great investment for a lot of couples as they save arguments and enable you to concentrate on other things rather than spending your precious time together cleaning. See also: outsourcing jobs like window cleaning, oven cleaning and even jobs like ironing, depending on your circumstances.