Edit: Also, if the books are Amazon books you downloaded to a previous Kindle, you can't just transfer the files to your new one - you would have to re-download them directly from your archive at Amazon, either directly from the Kindle or from your 'manage your kindle' page.You can purchase and wirelessly download Kindle books, newspapers, magazines and blogs from the Kindle Store as well as download and read other types of non-DRM (Digital Rights Management) text-based content on your Kindle Touch. Here's a list of file types recognized by Kindle Touch:
•Documents: Kindle (.AZW3, .AZW, .AZW1). Text (.TXT), Unprotected Mobipocket (.MOBI, .PRC), .PDF
•Audible:Audible (.AA, .AAX)
•Music: MP3 (.MP3)
Mobipocket files must have no Digital Rights Management (DRM) protection applied to readable on your Kindle Touch. If you purchased a Mobipocket file from a Mobipocket retailer, you will not be able to open the file on your Kindle Touch.
EPUB eBooks are not supported on Kindle Touch.