I became a certified trauma practitioner through the National Institute for Trauma and Loss in Children. I did it all online. Once I was done, I went through their Train the Trainer program and became a trainer for trauma and resilience.
Here is the link for their online classes to become a certified trauma practitioner: https://www.starr.org/ecert
If you would like to become a certified trainer for them, you would have to attend one of their conferences. I am thinking the closest one to you would be their upcoming one in Michigan. Here is the link: https://www.starr.org/clinton-twp-conference#CTT They ask that their trainers become practitioners first, which I think is a great idea. That background knowledge really allowed me to be more comfortable with the information and science behind everything. It's pricey, but I did it one course at a time and was thankful for the experience.
I am not authorized to train others to be trainers for their material but I train some of the required courses for certified trauma practitioners. If you decide that you want to bring a trainer in for these workshops, feel free to contact me and we can see what we can do. I offer workshops for clinical and school settings and will only train the courses that are needed for the certification so that the participants can gain the certification and register for the Train the Trainer course.
I hope this helps? Let me know if you have any questions.