If you can go to both, that would be ideal. If not I would start with the T3 (Train the Trainer) 101. If you have not developed technical training, I would also recommend the book Developing Technical Training, available from the online store. I had to re-read the first few chapters of the book a few times to really understand the concepts, but after I got it, it was very helpful. Its the best 32.00 I've ever had a company spend.