Like pp have said, figure out your favourite meals and how you can make them simply. I work FT too, so I get how busy life can be!
The DC and I love all sorts of different things, so we have a selection of meals that I’ve frozen into single portions. Soups, pasta in sauces/bolognese, chilli con carne, Thai food, meals from around the world, curries, home made “fakeaway” meals etc. They’re all labelled and we use them for lunches or suppers. My DC have food flasks that will keep food hot for hours (they use these for school/work/days out). They pick what they like and defrost/reheat. I will also get portions of meat/poultry, cook them, portion out and freeze (good for salads, wraps or if we want to make a super quick roast style meal). Porridge or Bircher: I’ll make 6-8 portions worth and put in fridge - just heat up in microwave (and add whatever toppings). I’ll precook jacket potatoes and then freeze them too (they come out really well). I’ve even made a giant sheet pancake and sliced that up/frozen it. Great for morning pancakes 🥞
I can make bread but will often buy yellow sticker bread, slice it up and freeze. I make Greek yogurt in the instant pot. Preserves/chutney is made on days off and when I have fruit/veg that needs using up. I make vegetable stock paste once every 6months (or thereabouts).
Meal prep is done on my days off. I can cook but will use gadgets to make my life easier (Thermomix, slow cooker/instant pot, air fryer).
Maybe start by cooking a large one pot recipe: have some for meal that night, and freeze the rest. Build up some bits that way.
It sounds like a huge faff, but - for us anyway - it means that we always have healthy home cooked meals in the house on hand. Also means a very low food bill, and very low/minimal food waste.