Evelyn's comments are 100% on the money. All I'll add is:
Be able to describe your book on paper first in 3 sentences, then in 3 paragraphs, and then in 30 pages.
The 3 sentences should be concise and compelling. The 3 paragraphs should explain the idea fully as well as your qualifications for writing it. The 30 pages (double-spaced, 12-point type, 1-inch margins) should demonstrate your writing style.
Consider those 3 things your broomsticks of the Wicked Witch of the West: Don't contact anyone professionally until you have honed those until you are proud of them.
And what Evelyn said about completing the manuscript is correct. You are an unknown author with no "platform" for publicizing your book. It will probably not sell unless you complete it.