Nappies, wipes and baby clothes/blankets. Maybe a bassinet/cot if you don't want to bed share. Some frozen meals. A camera. People lined up to help with cooking, cleaning and assisting you to sleep. That's all I needed for 6 weeks or so!
Diapers , wipes , bottles , clothing ( including socks mittens ) car seat , bassinet or crib , blankets .
I think those are the most important .