If you are a current leader, archive your course when you finish it this year. This is necessary because there can be only one active course per group at a time. The archive icon is in the ACTIONS column on the far right of your courses page:

You will be prompted to type "ARCHIVE" (all caps) in the box and click the YES ARCHIVE IT! button.

After your course is archived, click the CREATE NEW COURSE button on that same page and proceed as you did last year. Make sure you know which "Base Year" your church will be using this year.