Will I need to stay in hospital until baby is feeding well? If so how long is this?
Assuming an uncomplicated delivery and a healthy baby, then the midwives will just want to check your feeding method and be happy that you know how to latch baby on and initiate feeding. You will get more visits at home from the midwives and then the health visitors. They should also give you details of how to get support with breastfeeding if you need it.
What if baby wants fed while I’m out let’s say doing the school run….. can I express my milk into a bottle before the school run and take this bottle with me?
If the baby wants to be fed when you're out, the major benefit of breastfeeding is that you can just feed them, wherever, whenever. No prep needed. It's recommended that you don't start expressing until your milk supply is established, eg 6 weeks ish, as it will interfere with the normal supply and demand process between you and your baby. Plus it's extra work, hassle, prep, cleaning, time that you don't need to do. Having been forced into expressing from day 1 due to poorly babies I would not suggest you express unless you absolutely need to.
For things like the school run, feed the baby before leaving the house to minimise the chances of needing to feed again. But I have sat on the benches in the school playground many a time breastfeeding my youngest whilst waiting to pick up my eldest. Or in the car if the weather was not great.
How long would that milk in the bottle last without going off?
Here are some guidelines about breastmilk storage:
kellymom.com/bf/pumpingmoms/milkstorage/milkstorage/
Do I need to buy special nursing clothes and bras?
No to nursing clothes, not if you don't want to. Many women use the two tops method, where you wear a vest top or similar underneath a tshirt or other top. Then you just pull the vest down underneath your boob, and bring the top tshirt up above your boob. I used to have a large muslin to hand as well, just to cover me whilst I was sorting baby out, then once they're latched on you're all covered. If you have a baby prone to popping off and looking around, then I used to tuck the muslin corner under my bra strap, so I could easily bring it across me to cover up if baby suddenly unlatched.
You will need nursing bras though. Your boobs can get much bigger than normal, although not always, mine didn't change much. So nursing bras often come in stretchy soft fabric so that they can adjust. You will need nursing bra straps to enable the cup to be pulled down.
In the early days of breastfeeding it is very intensive, but the payoff is that it gets easier and easier and requires very little planning or equipment when it's all working well. Your partner, if you have one, should be doing everything else pretty much for you and baby in the first few weeks so you can rest and establish feeding.