EPUB is a free and open e-book standard. I can read this edition using Calibre on my Windows PC. I’ve been told it also works with FBReader on Android, Google Books on Android, and iBooks on Apple’s iOS.
The Lulu self publishing project form page is simple enough. Make sure you already got your ISBN if you don’t want to use theirs. Although, as I note in that post, I’d recommend letting Lulu (and Amazon, etc.) provide you with free ISBNs at first and only buy and use your own later if anything you write gets popular. We chose to make Chapter One: Servitude the book preview and simply used the ebook cover as the marketing image.
- “ISBN FAQ” on Lulu.com, 2014/06/11