How to make it work with Baby #2

Currently pregnant with baby #2 due in March and DS#1 will be turning 2 in February. We bed share in a queen bed, just me and him, my husband sleeps on a twin bed in other room. We have no structure or schedule to our day really. When my son is tired I lay down with him and he goes to sleep. Some days he wakes up at 7:30, other days it's 10:00am. He rarely sleeps through the night. I have no clue what I'm going to do with a newborn in the mix 😬 Any advice or testimonies of bringing home baby #2?