A big achievement will be when the language in the policy includes sexual orientation. Gather information about the risk behaviours of GLBT youth and the risks they face from the outside world. The Fenway Community Health center in Boston publishes such a survey every other year. While it is important to be able to respond to the religious and political right, a lot of the time your words will fall on deaf ears. But, just in case, it is not a bad idea to know first-hand the Bible passages that will be thrown at you.
Sexual orientation is one's identity in the world.
It helps define a person's attractions and romantic interestes. Sex is sex. When we see straight people we do not reduce their identity to what they do behind closed doors. You can have a notebook available for youth to enter their testimony. Teachers, parents and others can be advised to do the same.