having trouble

Currently on maternity leave and I have until November to start a routine. My only issue is I have to be at work by 5am and before baby I would sleep by 7/8pm. I don't know what time to start the night routine for my son and he still wakes up to eat every 3-4 hrs. I wish he can sleep through the night so it can be easier for a routine. I just don't know how I'm going to do it when I need to get to bed since I work at the crack of dawn. Changing careers is on my mind but it's gonna take some time to get my teaching certification. Any suggestions!? I need some guidance.