Creating a Simple App in Xcode 4
Use the Tab Bar Application project template to create a simple app that includes custom buttons, playing a sound and running a short animation. You can download the images and sounds at http://www.webbie.org/youtube/assets.zip
If your using a more recent version of Xcode, check my new tutorial that demonstrates this app using Xcode 4.3.3 at • Create a Simple App in Xcode 4.3.3 . I think it will answer many questions since the recent changes in Xcode.