Routine/feeding

FTM here so I’m completely new to all of this. My son will be 2 months this week and although I don’t plan on starting a routine anytime soon, my questions are, at what age is the best to get a routine going? And what are apart of your routines if you already have one or what do you plan do for your routine?

Also, a side from that, how long is it okay for a 2 month to go without eating? I find my son sleeping past the 3 to 4 hour mark sometimes and I never know if I should wake him or not.