As iOS development is only officially supported on the OSX platform, you will need a machine that runs OSX, the XCode development tools, and a subscription to Apple's Development Program. You can find details for XCode and the Apple iOS Developer Program here: http://developer.apple.com.

Information for joining the iOS Developer Program, the Terms of Use, and other policies not specifically covered in this book, can be found there.

You also need access to the Unity development platform and the iOS plugin, which can be obtained at: http://www.unity3d.com.