AFAIK, if you create a new project in CodeWarrior, it will bring up a dialog asking if you want an empty project or MacOS project with MacOS being a disclosure triangle. Open the disclosure triangle and I can't remember what the options are, but look for the non-ANSI option, and it'll create a simple sample program for you. The ANSI options also create simple programs for you, but that's probably not what you want.

Also, the InfoMac archive's development directory can be useful, although I've personally found it to usually be more time consuming to find something useful in it than to research the area myself.