Welcome to the community! I must say you have jump in pretty deep with Linux on the Kurobox. You are very limited if you do something wrong with the filesystem. Most anything you do though, we can undo. Just NEVER type the word /dev/mtd<anything>. These are the irreserviable steps. Make sure you know what you are loading before you do this. Anyhow I am sure you'll make your way quite well. I might reccommend downloading a LIVE CD either Ubuntu
These CD will let you run Linux on your home system without ever touching the har drive.