How am i gonna put all my kids to bed!!

I have a 4 year old, 2 year old and a newborn in 3 weeks!

I have to put my 2 year old to bed first, shes constantly getting out of her bed so i have to keep putting her back all the time! Sometimes for 30 minutes!

Then when my 4 year old goes to bed i.have to sit with her until she falls asleep otherwise she will scream bloody murder!!

How am i gonna do this with a newborn aswell? Ill have to leave the baby in his cot and hope hes not screaming aswell!

Iv tried to out the girls to bed together! Disaster! Nothing i have tried works!!

I have my husband for help but what about when he goes out one night? Or i go out! Ahh help!!