To quote the Public Domain Mac Programming FAQ Answer sheet, you'll need
"a Mac, a lot of time, and a few hundred $."  Programming on the Mac
is not for the faint of heart.  Get the Programming FAQ via ftp from
<ftp://rtfm.mit.edu/pub/usenet/comp.sys.mac.programmer/> and read it.

There is now a newsgroup devoted to programming games on the Mac:
comp.sys.mac.programmer.games is the best place to ask questions about
the subject.

Another excellent and comprehensive source of advice on the subject is
Will Iverson's document, I Want To Make a Mac Game, available at
<ftp://mirrors.aol.com/pub/info-mac/dev/info/>.
I strongly recommend that interested beginners read this from cover to
cover, as it were.

The book _Tricks of the Mac Game Programming Gurus_ from Hayden Books is
worth buying if you're serious about Mac game programming.  Contributing
authors include fellow comp.sys.mac.games inmates Ingemar Ragnemalm, john
calhoun, and Bill Dugan.  More information about the book is available at
http://www.mcp.com/hayden/mac_game-gurus/index.html.

You might also find Antreas Hatzipolakis's guide to Internet Shareware-
Freeware Programming Languages For the Macintosh useful; it's at info-mac
at <ftp://mirrors.aol.com/pub/info-mac/dev/info/>.

And good luck!