I bought what seems to be the most recommended book in the area: Cocoa Programming for Mac OS X - Third Edition, by Aaron Hillegass.
Although I’m not a programmer by profession I started coding in C when I was 12 and C++ some years later so I’m hoping Objective-C won’t be a showstopper.
I already have 2 projects in mind, more on that later.
I expect to have a review of the book in a few days.
This book is on my wish list, I will wait for that review.