I fail to see why you are on here looking for additional mentoring/training? Your Master should be able to train you perfectly well to meet HIS desires.
The traffic light system is usually fine in my opinion.....my new sub and I haven't decided on a safe word yet, as she hasn't been subjected her to anything painful; there are some very interesting words quoted in this thread!
Male Dom in a vanilla marriage...recently found a female sub in a similar situation, so we are currently finding out more about each other with a view to taking things much further