You'll feel more on top of things if you sort out your kitchen first, followed by the bathroom and then the hall, followed by the sitting room.
For the kitchen, sort through all your cupboards and pantry. Take everything out. Throw out everything past its expiry date. Do the same for your fridge and freezer. Wipe down all cupboards and clean the fridge and freezer. Put back what you're keeping. Look at your drawers - again, take out everything and throw out what you ne er hse, anything broken, rusty, any duplicates of utensils. Clean drawers using microfibre cloth, replace items you're keeping. Go through your plastic storage and throw out anything that doesnt have a lid amd lids with no containers. Look at your cleaning products. Throw out stuff you rarely use. Go through plates, cups, mugs, bowls. Get rid of all chipped, cracked, barely used items.The kitchen could take a few days.
Put stuff that doesn't belong in the kitchen. Into a basket or box. Find where it goes and put it there.
Try to make a habit of leaving your kitchen sink clear and sparkling every night.
Bathroom- similar cull. Throw out shampoo, etc that has less than an inch in the bottle. Get rid of old toothbrushes and toothpaste. Throw out or bring back to the pharmacy any old , out of date medicine.
Go through the hall with the same approach - a box for stuff that doesn't belong, get rid of superfluous items.
Same goes for sitting room.
Do your own bedroom last.