I've got a Flash projector which I plan to distribute on CD. I'm making a projector for Mac and Windows. I know how to do Autorun on Windows, but I want to do so on Mac as well.
How does that work?
It doesn't. Mac OS 7–9 had a similar system but Mac OS X has nothing of the sort.
Your best bet is to make a nice Finder window design that makes it clear what to do. DropDMG may be useful.