I'm a total newbie to machining. I got this machine to make some small parts. It's a Sherline 4000 Lathe with a stepper motor installed in a cabinet with a RS232 25 pin out. I have an older laptop that I'm planning on using for the software.

My big question is, is there free CAM software that I can use for experimenting and learning with the machine before I spend any money?

Also, where is there a good resource (book, videos, etc) where I can learn a little bit more about basic machine setup/how to make certain kinds of cuts/internal threading/etc? Any help would be much appreciated!

Edit: Here are some pics.

Sherline CNC Lathe by bedheadben, on Flickr

Sherline CNC Lathe by bedheadben, on Flickr

Sherline CNC Lathe by bedheadben, on Flickr