Peter Boyer, Matt Jezyk, and I did a presentation on getting started with Dynamo, and I have posted the step by step instructional on the GitHub wiki. If you are just looking to get started, or have mastered the initial concepts, this pdf can help. Starting from the basics of how to launch and make a point, through formulas and custom nodes.
The lessons are:
-Getting Around in Dynamo: Installation and Interface
-Create a Point, or, "Hello World!"
-Creating and Laying Out Geometry on Lines, Grids and Lattices
-Synchronizing Family Instance Parameters
-Doing Basic Math with the Formula Node
-Attractors: creating relationships between elements
-Using Revit Geometry in Dynamo and Placing Adaptive Components
-Using Python to Build a Sine Wave in Dynamo
-Using Custom Nodes and Recursion to Create a Fibonacci Sequence
buildz: Learning Dynamo: Programming for Non-Programmers Workshop