With only slight changes in your regular pattern of documentation, it will become second nature to document your teaching and reflections on teaching as well. There are common elements, however. Most portfolio entries are reflective, whether they reflect on the primary documents of teaching or reflect on larger concerns. A number of options for entries in your portfolio are presented below. A teaching portfolio should be kept in a loose-leaf binder for flexibility.
Teaching is dynamic, and reflection on teaching makes it even more dynamic.
So you can expect your portfolio to grow and change over time. Moreover, you'll want to be able to take your portfolio apart and put it together in different configurations for jobs, grants, or awards you might apply for. For your own purposes, consider keeping a table of contents, and be sure to provide one whenever you submit your portfolio with an application. Some job applications call for specific primary documents such as a sample set of evaluations and letters of recommendation. You might want to ask a faculty mentor or advisor for letters.