Hello there TEUSeller,
It sounds like you have the audio book on your computer and want to get it to your iPad. You can sync the audio book over to your device with the Books tab in iTunes when you have the device selected.
- Open iTunes.
- Connect the iOS device to your computer using the included USB cable and click the device button in the upper right corner. (If you are viewing the iTunes Store, click the Library button in the upper right corner. The device button will then be visible.) Some tabs may not appear if you do not have corresponding content in your library. For example if you do not have any podcasts in your library, the corresponding Podcasts tab will not appear.
- You can configure the different content types in each tab. For example, movies under the Movies tab.
- To sync, click Apply, in the lower-right corner of the screen.
From: iOS: How to transfer or sync content to your computer
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