I havent brought my baby home as yet lol, but i have bought a child monitor which i will put in the baby's room and close the door so that she doesnt wake DS during the night, but ill be able to hear her wake up via the monitor.
Same here, im sure after awhile DD will get used to her brother crying and he will get used to her making noise in the day. I found with DD when she was a baby to not tip toe around her and she would sleep through anything so hopeing it will be the same for DS when I bring him home with DD running around etc.