When my son was five mos old I had to move him in with his sister who was four at the time.
First, can I say discourage the pacifier, that will lead to constant battles with sleep and disruption of sleep if it were to fall out as your daughter gets older. Personally my kids once they started babbling wanted nothing to do with the pacifier and I was relieved. It will save you from a habit to have to break and you having to jump everytime they lose it or it falls out.
I would put a monitor in my room and if I heard my son move around or act like he was going to wake, I would hurry and get him up and had a diaper area in my room and fed him in there so it didn't disturb my daughter. Thankfully she was a sound sleeper and rarely woke up. It was later that was an issue and I had to start staggering bedtimes and put my son down first so that they didn't goof off.
Kids get used to sounds and unless your daughter is inconsolable then I wouldn't worry much. I did get my son a lot faster then his sister when he would fuss just due to worrying about waking his sister up, but after a while I would let him fuss a bit and she slept through it. It was a challenging when he started waking at 4am to play however I would just get my daughter and put her in with me early in the morning and she got to go back to sleep and it encouraged my son to do the same. Eventually it all worked out.
My kids are 4 and 7 and still share a room due to the layout of my house. I put my son down 45 minutes before his sister so it give me one on one with her and he is sound asleep by the time she goes in. Thankfully both wake about the same time and it is a rule if someone wakes up first to be very quiet and just lay in bed until everyone else is up. Good luck.