We started from the day we brought her home, just trying to get in a routine. I was bfing, so I made sure I fed her every 3 hrs during the day (so waking her if I needed), and 5 hrs at night (again, waking if I needed). So I'd start the day around 7, aim for the next feed by 10, and basically the time in between was feeding and napping (and sleep training). I sort of organized the day around her feedings and went from there.
hth
michelle