First night home with newborn - what do we even do?

We left the hospital yesterday with our daughter and now we're home and I honestly have no idea what I'm doing. She's sleeping right now but I'm too anxious to sleep. Is she breathing okay? How do we know if she's hungry? My wife is exhausted and I don't want to bother her but also need someone to tell me this is normal. Anyone else just stare at their baby to make sure they're still alive?