If you already know who your teacher is, I would try to find their website on the university webpage (or elsewhere). They would likely have class notes from previous semesters that you can use to get a sense of what your teacher will cover. Of course, your teacher may use a different curriculum, but you can still get a good sense of what will be covered. Teachers tend to reuse lesson plans since they take a while to create, and sometimes the lesson plans are due to what the departments and other higher ups will dictate. Also, try to find past students who took the course. They may have notes you can look over. They could also give you a rating of how the teacher is in terms of effectiveness.
If you have no idea who the teacher is, then I would search out "Introduction to Written Communications" and try to see what pops up. Restrict your results to the college you're attending so the results are most relevant.