Do teachers have to come up with their own lesson plans and textbooks for their courses?
Sometimes. Most institutions will provide their instructors with at least a syllabus that guides you in what you should be teaching as well as a pre-selected textbook for the course. Many institutions provide well-developed lesson plans and even presentation materials, ideas for activities and assignments, and standardized exams. In addition, most textbook publishers provide a wealth of supplemental resources that go along with the textbook.