Here is a checklist of things that you should aim to do after orientation.
Pay your tuition.
Review the Academic Calendar to become familiar with important dates and deadlines.
Buy your books. You can look up required texts by class at the University Co-op.
Locate your classrooms.
Check your Interactive Degree Audit (IDA) to see how the courses you registered for during orientation will count toward your degree.
Look for student organizations that might be of interest to you.