Opening line should be a simple hook. Let the agent know word count and genre.
Give the agent a idea of who (in numbers#) they can market this to.
Take a paragraph to sum up the story. Talk about your main character on a personal level(like that character is real).Think intimate commercial (tantalizing) with why people would like reading it. Think of this in a flirty way sell the idea of reading this book. Like a kid trying to convince a parent to get him or her something.
A small bio. include writing experience, workshops, published journals...
Thank the agent for their time.