All the student information is here. On the left hand side you will see a table of contents. Be sure to make your way down through all the topics. There are some important online forms for you to fill out, if you haven't already (housing, student organizations, etc.)
Registrar: The Registrar's site is here (which is the old address and should not change in the future). This site has all the info you need about registering for classes, checking schedules, school calendar, etc.
I hope this helps, even if only a little.