Hello.
I write a blog about being an author based upon my own adventures and discoveries, and having published 7 books and recently converted them to eBooks I've found MobileRead forums to be a great resource.
I'm adding links to 2 recent posts about eBooks:
Create an eBook with Sigil | Free Video Tutorials
8 free video tutorials showing you how to create eBooks, using Sigil eBook Editor, that work with online distributors, popular eBook readers and your customers!
Create an eBook with Sigil | Free Video Tutorials
Create an eBook as an eBook
Trying to turn a paperback book into an eBook—two completely different technologies—can raise digital barriers for authors, but what actually works?
Create an eBook as an eBook
Cheers
Stephen Outram
stephenoutram.com