Begin in MinistrySmart Academy & search for Volunteer Management. There is a 5 part series that will teach you the building blocks of the Realm Serving Teams.
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QuestionApps - Realm Connect and Realm Shepherd Admin SettingsGroupsCommunicationsRegistration EventsGiving and PledgesVolunteer Management
I found the Realm education on Volunteer teams quite good. Go to the education site and search Volunteer. Take the Essentials courses first then the webinars.