I'm a teacher also. I was in your shoes not too long ago. Have you heard about the Summer of Learning?? You can check it out here: http://www.cs2n.org/summer-of-learning
This is a great opportunity to take the summer to learn ROBOTC principles and how to apply them to your class. We have a section on the forum here dedicated to the summer of learning so you can ask whatever questions you want. Moreover, there are lectures recorded that help guide you through the ROBOTC curriculum.
I love talking to other teachers about ROBOTC. Please let me know how I can help.