Audio in iOS app

I am new to iOS development and am trying to add audio to my app. I have watched several videos and read some documentation on this topic but have not been successful. I have gotten several pieces of code together and have tried the wav and mp3 format with no success. I have used the Audio Toolbox and AVPlayer frameworks. I am using Xcode4.5 and the iOS6.1 simulator.

Could anyone please direct me to some good tutorial and/or good documentation. If you could explain how to do this in this forum please do.

Thanks in advance!