Hi, The newborn will need you at her sleeping time from 6 months to 1 year and yes after that I think you should have their rooms together to have a better bonding time :) I grew up the same way and it helps :)
The newborn sleep with you first for 6 month to 1 year. Then let them sleep together to bond. They are many other ways to let them bond but sleeping might be better with you for newborn/baby.
Depends on how light a sleeper your elder child is. Mine is a very light sleeper so it was a bad idea. One wake up, both wake up and end up no one sleeps. 😅
Better to let baby sleep in baby cot beside you till baby is 6 months. You can put the children in the same room after 6 months.
Can but wait till your younger one turns older, 10 mths old will be better.
I find it more convenient to have the newborn in my room