Twin pregnancy / newborns shopping guide!

So you are expecting twins? Congratulations! How are you doing? I hope you’re keeping well. I hope you’re here in a state of calmness. But it’s okay if you are not. Being pregnant with twins is scary. Are you perhaps worried, squinting at lists on the internet at four in the morning when you can’t sleep because the kids are fighting each other in your uterus and then your brain starts working and you need to do something to get ready because god knows you don’t know what you’re doing and you get googling and are led, perhaps, here, hoping for some sane suggestions?