Look for courses that you think you'll enjoy. Consider the amount of reading each course requires. Take introductory courses in majors you are considering. Follow course prerequisites. Most sequence courses, such as chemistry and languages, begin in the fall term.
All courses count toward graduation.
Consider your interests as well as what requirement is fulfilled by the courses you take. If you are unable to register for a course you want, place your name on a wait list, so that you will be given the opportunity to register if an opening occurs. Ask your adviser to make a note in your file of any special need.