We're working on it! At the moment the Cookbook is on the, ha! "back burner" while we polish up the firmware on the Dock and the rest of the software stack that it depends upon. Once all the underpinnings are shiny, then the Cookbook will become more than the awful, awful horrible mess than it currently is.
My advice at the moment: Run Rockpool and just fiddle with things! Get a feel for inputs and outputs, connect them together, try playing with some of the converters. You'll be rewarded for casual exploration of the system!
This post sums up how it's best approached: http://forums.pimoroni.com/t/flotilla-with-rockpool-for-non-coders/1765