Congrats on your acceptance and funding! I haven't gone through the process (yet) but from what I've read the school should be able to help you get your visa - you will need to get documentation from them before you can get your student visa, so as soon as you have decided where to go and accepted the admission, you should contact your department about how to go about getting your student visa. I'm planning on getting a bank account and driver's licence when I reach wherever I'm hopefully going - most states (if not all) allow foreign students to get driver's licences, so you don't need an international one. Finding a place is going to be tricky, because you have to start from very early, because a lot of the good rentals near to a college are taken by returning students early in the year, so I'm not entirely sure how I'd go about finding housing. I'd hate to have to commit to a place before I've seen it in person - perhaps a visit (if possible) to the city of your school a few months before you go for grad studies could help you find a place for the fall. Schools often have a lot of housing information (both on-campus and off-campus) on their websites and some schools have listings where approved landlords can post places that are available to staff and students to rent/lease. Perhaps you can look for such a listing on your schools website, or contact the department or international student services about advice for where to live.
I just googled your school and found this: http://oisshome.wustl.edu/students/new/newindex.html It seems to answer a lot of your questions.