Your best bet is to grab a book on it.
I'd recommend Stephen Kochan's "Programming in Objective-C 2.0". The author is even a member of these very forums.However, you have to at least understand objective-c. If you don't understand that you may want to get programming for the mac by Apress as well.
I'd recommend Stephen Kochan's "Programming in Objective-C 2.0". The author is even a member of these very forums.