Over the years, I've helped probably well in excess of 100 clients move into council/HA property!
Freegle and Freecycle are your friends. Friday Ad & Gumtree are great for cheap 2nd hand stuff (one client got enough laminate flooring to do the whole ground floor of her house for £15). Independent carpet shops are often much cheaper than Carpet Right etc and often have offcuts. For the kids' rooms, those rubbery squares that interlock will keep the cold out until you can get carpets.
Plastering can wait, I moved into my house in 1993 and have only managed to get one room replastered, filler and a good rub down have had to do elsewhere. Get a second hand oven for now. Charity shops are great for curtains, which will suffice until you can afford blinds. They're also better at keeping heat in in the winter.
When I moved in here and found there were big gaps in next door's hedge, I got some of that orange netting stuff they use on building sites to keep the dogs in, it's cheap as chips. Clearing the garden of undergrowth can be done a bit at a time, although a friend of mine threw a garden-clearing party and got about 10 mates round, plenty of beer and we did the lot in a day.
Bear in mind that your rent will now be a lot less, so you can use the money you're saving to buy stuff for the house.
Some stores still do interest-free credit, which will be cheaper than using a credit card. Make sure everyone you know knows that you are moving into somewhere that needs flooring, window coverings etc and you will be amazed how many of them will know someone who's ripping out perfectly good carpets etc. If you have a furniture recycling place near you, they often have carpet and other bits and pieces.
And, to be fair, you do sound a bit entitled. I bought my first house in 1982, and couldn't afford a new cooker until 1993. I had second hand ones. And it was 25 years after I left home before I could afford a new bed!
Just do one room at a time, as and when you can afford it.