FTM dumb question.

I'm a FTM of a 5 day old baby. Feeding so far has been a really hectic mess. I wanted to breast feed but due to some complications she latches on the breast or she gets a bottle of expressed breastmilk. My dumb question of the day is i know she needs to be on a feeding schedule but the problem is she will go an hour and want to nurse again or she could go four hours before she shows any sign of being hungry. Do I have to feed her at the same times every day? Like set a timer and feed her at 3a, 6a, 9a, noon, 3p.... so on and so forth or can i feed her whenever she's hungry as long as she isn't going like 5+ hours with out food? I know I might sound super dumb but I just need guidance. Thank you.