baby's essential

Hello mummies, trying to gather information on baby's daily essentials, I'm now in my third trimester to get ready for my first baby's arrival. I currently have a passed down chicco playard, and just wondering if I still need a mattress with fitted sheet for the newborn and also if the baby needs a pillow or blanket? Or swaddling is enough for frequent aircon room. And also when do you start preparing the essentials for your baby's arrival? Please do let me know your recommendation, TIA!