When we had a book signing at your store for my first book last year, we sold 21 copies, and I expect my new book to have similar appeal to readers.But one went like this:
The signing at your store for my first book was scheduled at the last minute, and we didn't really have great media, so sales were disappointing.Okay, "disappointing" is an understatement. I'm pretty sure it was one or zero books sold. There was another book signing where only two books were sold, but there was also one where 32 books were sold! What was the difference between the events?
In addition to the bookstore's publicity efforts, you need to work to get at least one story written about you in the local newspaper. If you can snag a spot on a local television morning show, that is also great, but in my experience, newspaper stories net the largest number of attendees at signings. It makes sense when you think about it -- newspaper readers are readers; television viewers are not necessarily readers.
And you will sell more books if you have a talk planned. Most people are more interested in hearing what you have to say, rather than just saying "hi" and having you sign their book. If they are going to take the time to go to a bookstore, you need to make it worth their time. Tell them about the writing process or what inspired you to write the book. If the book is autobiographical, tell them something that isn't in the book. Give them the chance to get to know you a little better.
Obviously my second email above did not end with a reminder of disappointing sales numbers. I went on to mention that many of my other book signings sold 20 to 30 copies with proper planning and media placement and that I was confident we could do as well if we scheduled another book signing with the store this year.