You could download a free ebook reader then download ebooks. I was looking at one recently 'wattpad' it was called if I remember correctly , they had free ebooks too.
Do a google seach for 'ebook reader for blackberry'.
I suggest you do a homework for this. Get audio books usualy in .mp3 and use Desktop manager or Removable MINI SD card to place them on your BB, then use BB mediaplayer to play books, it is complicated to put SAM PC voice into BB.