Read up a little bit on what the baby bit is like (but don’t obsess!). Once I understood about cluster feeding/growth spurts I coped with them a lot better as I knew they wouldn’t last long.
Do whatever you can to make life easier those first few weeks especially if breastfeeding as you will be doing all the feeds. Stock up on drinks/snacks/box sets/kindle books to make long feeding sessions easier.
Set up an online grocery shopping account and add all your regular stuff onto it plus nappies, cotton wool, breast pads, maternity pads, paracetamol etc. If you can’t make it out to the supermarket because youmve been up all night with the baby then order in instead!
Think about meals you can prepare easily and eat one handed whilst holding/feeding the baby - don’t do what I did and stock the freezer with homemade lasagne!
Buy cheap comfy pyjamas and big pants for the postnatal period, I also bought the nursing vests from H&M. I have about 4 or 5 sets so I can easily chuck them in the wash when they get dirty and put a clean set on. Ditto lots of vests and sleepsuits for the baby that are easy to change and wash - don’t faff around with complicated baby clothes those first few weeks. I found the multipack ones from M&S are good quality and wash well.
If friends/family want to help ask them if they’ll do a bit of ironing/run the hoover round/prepare a meal one evening etc. Practical help is a far better gift than piles of baby clothes and toys.
The “baby blues” around day 3-5 will probably make you feel a bit mental but hang in there - like most things it will pass.