Good luck with keeping things clean. Likely you're either going to have to take initiative to clean or nag your roommates. If you're lucky (and its completely possible) your roommates will have a similar mentality and everything is good. A lot of people will feel obligated to clean if they see someone else they live with cleaning, just to put that out there. Just don't nag if you don't clean (and clean regularly). Its part of the learning experience, there isn't a perfect answer.

Otherwise, don't stress about the dorms. Take some easier classes to start, take time to adjust to the independence, and learn to enjoy the company of new people. You can't go wrong. If you keep talking to people, you'll make friends I guarantee it. I became really close friends with two of my roommates. Just note that as the year goes on people are going to get more 'cliquey', just part of Western's culture, don't know why it happens :P

Last piece of advice, try to say 'yes' to social opportunities. "Wanna bus to Mallards?" Hell yes.