To help my online (synchronous virtual classroom) students get acclimated to the class flow and my expectations I do two things:
1.) Before the first day of class I post a detailed announcement "ABC123 Course Information and Expectations." The posting contains my contact information; my availability; schedule for all live sessions; details on what is needed to do well in the Discussion Threads; APA formatting guidelines and hyperlinks to support information; grading scale; late policy, etc.
2.) My first live Chat Session is "How to Earn an "A" in This Class." In this one hour live session I break the above announcement into PowerPoint slides. During the live session we go through the slides, and just before the end I ask students if any of this information was familiar. I then point out everything was taken from the announcement, and remind everyone how important it is to read all announcements each week.