Here are some of resources for creating gender inclusive schools/classrooms. Majority are from www.genderspectrum.org and www.welcomingschools.org. There is also a school climate survey that GLSEN puts out and you can even look up the data based on your state: https://www.glsen.org/school-climate-survey
Responding to "That's So Gay"
Checklist for Gender Inclusive Classroom
Responding to Student Questions
Responding to Concerns Teaching About Gender
Student Gender Support Plan
Talking to Young Kids About Gender
Welcoming Schools Starter Kit
Schools In Transition