Baby’s arrival prep

At which month do you all start buying stuffs for baby and preparing for his or her arrival? What are the first few things that needs to get settled? Is there any checklist where i can follow because i really have no idea what I’m supposed to get first. I’m gonna find out my baby’s gender this Friday and planning to get some stuff for my baby after that. Im at 20 weeks. Is it too early to prepare and buy baby’s stuff? #pregnancy #advicepls #theasianparentph