Can anyone please share the most important rules of confinement to follow?

I agree with Idza. It's easy to overlook this because so many things are going on concurrently and it's easy forget (or not able) to sleep/rest whenever you can. Tiredness will wear you out fast especially if you are handling a newborn and it's easy to fall into post natal depression. I've been there and it was such a dark period for me when I should have been happy about the arrival of my son. Pass your newborn to someone if you're tired and get a good rest. Otherwise sleep when he sleeps, and stop staring at him sleep. I know I did because I was paranoid about so many things.