Sterilization Before Delivery

Hello im preparing the nursery items before delivering and would like to ask the following qns: 1. When is it a good time to start sterilizing bottles and pump parts? 2. How many bottle sets do you sterilize? 3. After sterilizing and drying (i bought an avent sterilizer and dryer), do i just leave the bottles in the dryer? Or keep them in a separate “clean box”? 4. If i sterilize/dry 2 bottles at once, i open the dryer and use one of the bottles, do i have to sterilize the other one again before using? #firstbaby #advicepls TIA!