How to become a hair extensions trainer?

Hello everyone, I’m new here.
Looking for some help. I have been working on hairdresser industry for over 10y. Have L3 qualifications, specialised in hair extensions and Afro hair and qualified Assessor. Been working as self employed for over 3years and did 7y in the salon before that. Want to do hair extensions training but don’t know where to start or what is needed to become a solo hair extensions trainer. Help please