Follow these four steps for a a quick start to using open textbooks:
Step 1: Find an Open Textbook
Step 2: Review and Select an Open Textbook
Step 3: Customize your Selection as desired
Step 4: Disseminate Your Open Textbook to Your Students
For details see http://cnx.org/contents/e79d064a-2750-434b-98ad-7b5ef277410c@2/Open-Textbook-Quick-Start