I would like to download my arduino sketches via bluetooth, but I don't know where to start. This is part of a larger project I'm working on.
Yes, and it's pretty easy to do. see this post .
Here is a detailed practical guide that I wrote, which includes instructions for Windows and a slightly simpler scheme for using HC-05 with a common handout (we strongly recommend getting a module on a breakout): http://makezine.com/projects/diy -arduino-bluetooth-programming-shield /