First, I would talk to your OB. She/he should be able to help guide you regarding whether or not it even makes sense to start nursing or pumping, and can also incorporate your preferences not to nurse into your admission orders following delivery.
As to nursing the first few days, if you are 100% sure you do NOT want to nurse this time around, I wouldn't even start at all. If you nurse for a few days, your milk will quickly come in (especially since this is your third) and then you'll just have to deal with the binding and discomfort once you go home. It would be slightly more manageable if you don't even significantly stimulate milk production to begin with. Of course, if you think there is a small chance you want to nurse, even for a very limited period, by all means start, and then just wean as soon as you are ready.
Your OB should be helpful in navigating your no nursing preferences at the hospital. I would bring your own formula and bottles just in case, because the hospitals, especially once they have received the official "baby friendly" designation, are much more limited on access to formula and you might not be receiving the amount of samples that you did with your first. Also, as to rooming in, you may receive a lot of pressure on that regardless of nursing status. While there are certainly benefits to mom and baby with rooming in, the benefit to hospitals is that they can significantly reduce their staffing for newborn nurseries since they almost never have babies there anymore. So, sometimes the pushback that patients receive about sending the baby to the nursery overnight is a reflection of staffing changes that have resulted from being "baby friendly."
DD1 10/2010
DD2 8/2013
And expecting DS1 10/2016