if you're formula feeding you can not feed every hour. if you do it shouldn't be as big as her normal bottle. if you are breastfeeding then it is in demand. so whenever the baby is hungry no matter when the last she ate was. formula is harder to digest so I would at least kepp it @ 2 hours unless she seems like she is really starving.
completely normal. since she was just born yesterday congrats by the way, she will lose some of her birth weight and by two weeks she should be back up to birth weight or passed it. my son did this and then he went back to every two hours.