One can choose to have a press release, or do a press kit.  A press kit can contain:

*a photo of the author, the book, etc.
*a sheet about the book itself.
*a sheet about the author.
*a sheet about why the book is being published.
*a sheet about the publisher.
*a sheet about purchasing.
*a calendar of planned events important to the book such as signing party, etc.
*any other promotional material you can think of

This section is drawn from our marketing page at