You can find your required course readings in ARES. Most, but not all, of your instructors use ARES.
You won't see your individual course instructor listed. Only the lead instructor is listed. That's because all sections of a course use the same readings, so just add the course with the same course number (like NURS 503).
You can search by department, course number, or instructor, but often department [e.g. Nursing (NURS)] is the easiest.