I would like to work on the gradebook offline,so I can see what the grades are before the students see them. How do you do that?
You can export the grade book by clicking on Actions > Export in the gradebook. You also have the option to "hide" grade book columns or hide the Totals at the end of the grade book as well. I would recommend reviewing:
How do I select a grade posting policy for a course in the Gradebook?
How do I select a grade posting policy for an assignment in the Gradebook?
How do I post grades for an assignment in the Gradebook?
How do I hide totals in my students' grade summaries?
Retrieving data ...