Hello,
I have run couple of years online business and used indiegogo and kickstarter platforms for presales.
I also write on Amazon kindle for e-books on marketing topics. Presently, I am a MBA lecturer who works full time teaching marketing. I would recommend you to do the following:
1) Use Amazon kindle keep a campaign to test,you can also register for free book campaign launch.This way you would have a start.Scale up by using salesforce free license for 30 days to generate and engage your leads,referrals update all of them at one place.
If you need more info on how to schedule tasks and increase productivity and to answer all your questions regarding business of e-books please hit me up,we could discuss over the call.
I am confident you will have a good productive call with me.

Regards,
Abhilekh