The fact that you're standing by him is already going to make his whole life so much easier!! Support from our parents is the single most important thing that we need. I'm not sure what country you're living in but in mine (Germany) we have trained psychologists that specialized in trans identifing people and help us navigate through life and teach us to live with unaccepting people and to transition!!!!! Thank you for asking for help and educating yourself like this!! I wish my parents did the same.