Here is a link to a free online robotics course for Lego Robots. The course is officially designed for K-12 teachers. It teaches Lego Robots (using the NXT model) for ABSOLUTE beginners. The basics of programming using all of the different sensors and all of the content is open to everybody. If you're a teacher and you complete the course a certificate of completion is available.
The trailer on the video encompasses all that the course has to offer. Hope this helps!