I have added two more videos to my MySQL Document Store Tutorials for your viewing pleasure. Early in May I will be presenting a webinar that will be an introduction to the Document Store which will cover much of this material. If there is any specific that you want covered please let me know.
The first video is on how to use the Document Store to access relational tables. Yes, from the NoSQL side of the server you can reach the structured data.
And the second video explains the _id field which is needed as a primary key for the storage engine, how you can supply you own values (no conflicts please), and how the server will generate values.