You can find a lot of excellent resources to study and to research on the Webex Help Center.
https://help.webex.com/en-us/
They have pages dedicated to classes in addition to this.
Free Online Classes -
https://help.webex.com/landing/onlineclasses/upcomingClass/Webex-Training#Conducting-a-Webex-Training-Session
We also have a wide variety of Webex Adoption Playbooks found here -
https://community.cisco.com/t5/collaboration-adoption-documents/webex-adoption-ebooks/ta-p/3892085
I would suggest also reaching out to see what over training may be available, as Webex has different offerings from Basic, Enhanced, to Premium where you can get access to a variety of other resources and people to enable your team for success!
Cheers!