You can find narrators at Voices.com either by using our search engine, browsing the directory or posting a job with a sample of your manuscript for talent to read from. There are talent who specialize in the field of audiobook narration, and some of those people exclusively record audiobooks. These are the talent who have established themselves as narrators for particular genres or niches. As was mentioned earlier, there is a currency to a narrator's brand so take this into consideration when scouting talent and reviewing auditions for your particular project.
Providing narrators with a few paragraphs if not a page of text for them to read from will give you a good idea of how they sound narrating your manuscript. Most talent will want to review a digital copy of the manuscript for its content before committing to an audition. By doing so, only the most interested of the qualified narrators will respond.
Additionally, provide details pertaining to audio file requirements such as file format, the separating and naming of files and so on. If you are going to be selling the audiobook on CDs, you will want the audio to be of a higher quality such as a WAV file than if you were simply selling the audiobook as a digital MP3 download online.
A good rule of thumb is to provide as much information as possible to your narrator ahead of time. This way, they can fully evaluate the project and be sure to impress you with their performance.