Telling my boss about my Autism diagnosis

Good Afternoon,

I work in a primary school as a one to one support for children with SEN.  Over the half term I was diagnosed with Autism and I want to tell the headteacher when i go back .....tomorrow.  she knows alot about Autism but I dont know what to do to prepare.  I have scripted out what I want to say but dont know what else i need.  I have made a list of my traits, stims and maskings.  am i simply over thinking this or do i need more?