RAs live on your floor and are there to help you. Get to know your RA, attend floor meetings, participate in orientation activities. You'll be responsible for your room, but you don't have to clean the hallways or the bathrooms. Be nice to the cleaning crew on your floor and in your dorm. Yes, they do get paid to clean your bathrooms, empty the trash, etc., but it's not a pleasant job.
Nobody likes to clean the toilets.
These people spend hours working for you and, for the most part, they are a congenial bunch. Your neighbors and the cleaning crew will appreciate your sensitivity. Don't overdo it, though. The temptation to pig out will be strong, but resist. The choices are vast, and dessert is always available.