|Khan Academy has many videos. With this, they have created a number of videos to help walk you through NTX robotics. These are the videos that I use when meeting with a group of students for the first time.
||Step 1: Create a Khan Account (just the teacher), HERE
Step 2: Go to Science — Electrical Engineering — Lego Robotics
Step 3: Have a look at Introduction to programing Using lego NXT