Hi @xJune88 FTM here as well, baby due any day now!
Essentials you need -
Somewhere for baby to sleep (I got the snuzpod bedside crib) & sheets/blankets/sleeping bag - I got cellular blankets and a grosnug which you can also swaddle in
Travel bits to get baby around (car seat, pram, wrap - depending on how you travel and what you want.) I got the Uppababy Vista system. Baby can nap in the carrycot during the day. Converts to a double if we have a second quickly. Nice big basket and loved the look of it! Got the Bsafe car seat to go with. Mirror to see baby when you're driving and she's in car seat. Haven't got a wrap yet will wait until herself arrives.
Clothes - I bought newborn and 0-3, you'll get lots of clothes as presents/hand me downs too so try to resist buying a lot. The essentials from the first month with baby is all you need ahead of time. Vests, Sleepsuits, hats, cardigans.
I'm planning to breast feed so haven't bought any bottles/formula. If the boob doesn't work out we can get the essentials in from any supermarket at short notice. For breastfeeding all I've got is nipple cream, breast pads and nursing bras.
Nappies - the size/weight on front will be your guide. Wait until nearer your due date and you'll have a better idea of estimated weight. Nappy cream, cotton pads, water wipes, changing mat, nappy bag
A few other non-essentials -
changing table (got mine free online to save my back with constant bending also came with baby bath)
nightlight, comfy chair for breastfeeding, first aid kit (thermometer etc), white noise app or teddy, toys for pram/car seat, etc
I'm sure more experienced mums will have better tips but that's what I've gleaned so far on here! Hope it helps!