Xcode. First Cocoa project. Tutorial.

Here is one of the best tutorials for beginners I've ever seen:
http://cocoadevcentral.com/d/learn_cocoa/

It shows how set up Xcode and create first Cocoa project. In the end you will have a working version of a notepad that cannot save or load text files, but has a number of features such as choose font or color or print out the document into a PDF. All it's done without changing the source code manually - you will need to work only with Project Manager and Interface Builder.

Another tutorial that does the same - build a notepad, can be found on Mac DevCenter:
Build your first Cocoa app.

This time the Cocoa Document-Based template is selected. It makes the design a bit more complicated to understand. But tutorial is great and explain many things that are interested for the beginners.