Professional development conference proposal?

I am a Reading and English teacher at a middle school. My team of teachers and I would like to attend a conference on middle school essentials this spring which includes many valuable topics such as content area literacy, differentiation, and the middle school philosophy. As the English teacher, I have been in charge of writing the proposal for attending the conference. The problem is that I am a first year teacher and have never written a proposal to attend a conference geared towards professional development. How should I open this paper? What other tips can you give me?

Thank you.
Our whole team wants to go. How can I mention why it is so important that all of us are permitted to attend the conference?

Just a couple of brainstorming ideas: How to prepare the middle school student to become a critical, independent thinker in high school; How can middle school teachers best support and encourage the transition from elementary school to high school; How to prepare the middle school student to meet the expectations of high school students…
I hope this helps some! Good luck!!