DS was born at 30+1, 3.2lbs and spent 6 weeks on NICU. He didn't really have many problems, just needed to grow big and strong. I had the steriods too, to help his lungs, and they worked as he came out breathing on his own and only needed CPAP for 6 hours, thankfully. WE both had antibiotics, and he was whisked off to NICU straight away so I didn't get to see him for 6 hours.
He was teeny tiny, had an IV line in his hand, an oxygen monitor on his food and three tiny wires stuck to his chest hooked up to a monitor that keep bleeping and scaring me, until the nurses told me to ignore it and watch my baby - not the monitors. I was too scared to hold him, but the nurses were like angles and helped me with kangeroo care.
Make sure you pack tops that are easy to get open and are big enough to get baby down the front as they encourage skin to skin, and kangeroo care.
The neo natal unit will have a lot of booklets by the charity Bliss, which will give you lots of info about prem babies and bringing them home.
My DS was in a nappy for ages, so we didn't need clothes for a bit, but we did have to buy the nappies.
They tried to send me home the day after my EMCS, but ended up stopping until the friday. The hardest part was being discharged without a baby, and being on the postnatal ward with an empty cot next to me listening to everyone else's babies crying.
Definitely ask for a tour if you can. good luck x