Might wanna get a toucam like the 900nc with an LX mod if your starting out and are strapped for cash. I have had far results when i started out afocal and planetary though it was more luck and a steady hand. You would be wise to buy a camera bracket which will hold the camera steady and allow for fine adjustments.
http://chdk.wikia.com/wiki/CHDK does suppport your camera and i would check it out
http://chdk.wikia.com/wiki/SD1300IS . I have used it with a powershot just for testing though it opens up a ton of features the stock firmware doesn't offer.
The first thing you want to do is loose that sticky tape lmao and at least make a bracket if cost is an issue. Have a look at bintel and copy one of there brackets
