Book Creator has a training program built into the app called Book Creator Certified Authors. This accreditation program is self-paced and is a great way for districts to assign PD and deliver renewal credits to staff.
You can even see which teachers have completed accreditation or are in progress by clicking on that column in the Teachers section.
To get the word out, use the picker to select which teachers you want to email (up to 100 at once), then click Bulk Actions > Request Certification, then click Preview.
You can customise the message before clicking Next, then Confirm and send.