Once you've identified the materials you want to use, you have to identify the best way to incorporate them into your course. First, check the license terms. Open materials typically have a creative commons license that specifies how you may use the information and the kind of attribution required. Now is a good time to reach out to a librarian to discuss your options.
If you are not interested in making changes to the text, you can provide the link to the book and/or the PDF (if available) in your course shell. In some cases, you may be able to copy and paste directly from the text into your course shell.
If you are interested in making big changes, you should contact
SUNY OER Services. They can set you up with an editable version of a text or shell in which to get started.