Newborn routine? Exhausted mama

I'm 4 days pp and I'm having a hard time establishing a routine for my new born. Her schedule is sleeping and feeding every 2/3 hours from about 6am until 7-9 PM and then she will be up until about 2 or 3 am. Not consistently awake for that 6 hours but she'll breast feed multiple times and take little cat naps. Everytime I try to put her down when I think she's asleep, she wakes up and cries until I pick her up and feed her. I'm not sure how to establish a routine. Any tips? I try and sleep throughout the day when she sleeps but it's pretty tough

EDIT: thanks ladies for the advice. I'm a FTM so its not that I assumed we would be on a great schedule with ideal sleeping patterns after a week. Not even after 6 months. I just didn't know if there were any stepping stones I could take to eventually establish a routine, that's all 😊 ill definitely be reading about the 4th trimester. thanks again (I'm only keeping this post up in case other FTMs had the same question)