Also, I didn’t even know how to properly format an e-book when I started.  Initially, I made things through CreateSpace and published on Kindle, which just copied the print version I’d made which really doesn’t look that good in e-books.  It was only when I published on Smashwords that I followed their guidelines for formatting and got it looking far better.  So now all my e-books use that and have  a version of the Smashwords license notes at the beginning, like this:

Smashwords Edition License Notes

This ebook is licensed for your personal
enjoyment only.  This ebook may not be
re-sold or given away to other people.
If you would like to share this book with another person, please
purchase an additional copy for each recipient.
If you’re reading this book and did not purchase it, or it was not
purchased for your enjoyment only, then please return to Smashwords.com or your
favorite retailer and purchase your own copy.
Thank you for respecting the hard work of this author.