Get all the diy/decluttering done now.
Sort out a 'station' upstairs and downstairs where you can sit comfortably and feed the baby - water and snacks nearby, phone charger, changing stuff etc.
Don't worry about a routine - instead let yourself and your baby discover a rhythm to your days.
Remember that everything will feel worse at night - cries seem louder, everything seems a bit more desperate, but the dawn will come.
Get your partner to make you a sandwich lunch every day or get microwave meals.
Pick a pram based on the terrain outside your house - have a look at how narrow/uneven/non-existent pavements are, and get one that can cope. So annoying to spend money and have to start again because the little wheels are no good where you live.
Also with prams, don't get a really expensive one - it's not a one and done purchase, you'll have more than one as your needs and your baby changes.
If you end up formula feeding, get a tommy tippee perfect prep machine and an all singing and dancing bottle washer and steriliser. With the perfect prep, set it up in your bedroom so you don't have to go downstairs to make a bottle when your baby is screaming in the middle of the night.
You'll buy and get given loads of stuff for your baby which you'll hope will change your life but will either never get used or won't work for your situation.
If you have a big baby, you might not have the strength to carry your baby about in a sling.
A really good, interesting, reassuring book is 'What mothers do when it looks like they are doing nothing' - so so comforting to read.
Nothing in the world is like the whirlwind of a first new baby. It's magical, brutal, wondrous and satisfying all at once.
If you google your issue and add 'mumsnet' at the end, there will be at least three threads on the same niche, specific topic which will have the answer you need somewhere on them.