Below are several links containing Presentations and Material for co-worker training:

Material for Co-worker Training 15 August 2020
Theme: The Lord's Prayer
Reflections on the Lord's Prayer (Pastor Dieter Klee)
Summary Sheet on the Lord's Prayer
Theme: Why study the Bible?
https://youtu.be/KK03kDWDEK4

Google Drive with written outlines and content of talks and bible studies: 
https://drive.google.com/open?id=1K5a3DAmqYOucxaBn6njDRfyF-H5vs0Of
 
Youtube Channel with playlists for Videoclips of talks, teaching sermons, and bible studies:  
https://www.youtube.com/channel/UCu53OkuKGsJuOab2didqRyg/playlists