FTM & what we need to buy question?!

Aryn
So hubs and I are first time parents! We are really having a hard time on planning what to buy, when to buy it, what to save and not buy (leave for the baby shower) and when to buy the big stuff! 
Also curious to know if any of you guys saved a certain amount before baby was due or just over purchased everything? 
How many diapers do I buy, formula, baby creams and soaps, ECT! 
I try and buy things when I find them on sale and pack them away~ we are moving when I am 4/5 months pregnant 😁😬
THANKS IN ADVANCE LADIES!