Dorms are usually crowded and typically shared by two people. But, the best part of a dorm is the companionship if you find a good roommate and the closeness to school. Usually you cannot have candles or high-voltage appliances. Most dorms do not even allow fish or other pets. Also be sure to find out whether you can hang curtains or blinds if there aren't any provided already.
Some dorms only allow white blinds to be seen on the outside of the window.
Others will not let you hang things on the walls, such as pictures or shelves. Those rules aside, you can now focus on what you would like to have in your dorm room, after all you will be living there all semester. First, measure your entire space. If you plan on sharing a room or a unit, be sure to write down all the boundaries in case of future disputes. Next, set up a budget.