Here I am again with suggestions. 1/ Don't do it all at once, but slice it up. Each slice is a separate pdf that is protected, and people who subscribe can get that code sent to a valid e-mail adress. The code is valid for what you intend to cover in the manual. Another advantage of this is that if ever you eed to add some content or find a better way of explaining, you only have to create a new pdf for that particular item/chapter. 2/ This way, you can start manuals at beginners level intermediate and even high-end at the same time. Each level would need a different code to unlock the series of pdf's. 3/ Add to this a protected members section on your site where subscribers can ask questions and exchange insights, evt. from time to time download something Start threads at the various forums asking people what they want to be explained, where the difficulties lie,... Only suggestions of course: it's your idea.

I have tried prudent planning long enough. From now I'll be mad. (Rumi)