Here is the listing of the current lessons available. Remember to sign up for our DDN Forum to aid you in working through the lessons. On the forum you can ask questions and (hopefully) get answers to all your questions.
Lesson 1 - The Basics
Lesson 2 - Building on the Basics
Lesson 3 - Constants, Types and Variables
Lesson 4 - Program Flow Control
Lesson 5 - Procedures and Functions
Lesson 6 - Putting it All Together
Appendix - Working with DCAL