Newborn bottle size

Im a FTM and will start buying baby stuff. For baby bottles, esp newborn, do i buy the smallest size (60ml) or just get the 2nd smallest (120+ml) size? Or buy both each to standby. I am aware theres also different sizes to teet for different age. And how many bottles of each do i need to prepare for newborn, can mummies help me out. #firstbaby #FTM