Need help with the beginning.

I am nghề viết văn a story, and I have a plot and parts of the story, but I am having trouble thinking of a beginning, like Chapter 1.

Plot:
Aria Glass is a demon hunter, along with her Những người bạn who are like family, Jared and Toby Heller. When Aria find out she is a Healer of heaven and that she is the key to stopping the Demon War that is about to submerge from Hell. With the help of a few rebelled Healers and one hell of a determination to do it her way Aria and her Những người bạn must stop the army's from coming to earth and fight the corrupted Healers from using Aria for something worse.
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Now I want to begin it after she had met the Healers and found out she is Half healer, but I'm not sure how. Please Help! I'll Give bạn A Prop!!