For the moment there are things like the Decker Tour (the thing that loads when you open Decker).
Anytime you see something that looks useful to you, you can switch to widget mode (Tool > Widgets in the menu) and investigate how it was made. The introductory concepts in the Tour (making widgets, what different kinds of widgets do, how to connect cards together, etc.) are the building blocks of any project.
There are also the example decks (in the 'Examples' folder that comes with downloadable decker) -- many of them will not be relevant to a rolodex, but it's the same simple process (Tool > Widgets) to start poking around what made things work. If you have specific goals or questions for the project you have in mind, then I'm sure someone here can answer questions or explain the concepts you need in a newbie-friendly way.