Follow-up for book about training

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I'm in the middle of a project where I'm going to market a book about training, but I had this idea that it would be nice to have some kind of follow-up system that people could pay for on a monthly basis. I'm however not sure what this follow-up should consist of, and it's gotta be good since people are going to pay for it.

Suggestions?

Maybe it's easier to just drop it and just focus on selling books? E-books, mind you, online.
#book #followup #training

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