Yes, the book is done. But that doesn't mean there will be more adding and subtracting words, paragraphs, and chapters (hope not).
Now is the time to find a few people willing to read the book and give their honest opinion. Come up with a catching short summary of the book, and a title that will grab people's attention.
My editor said for me to find people who like to read. Have them read the summary, let them look at a short list of titles I have chosen, and ask them which one they like; or give one of their own suggestions. I thought that was a great idea. Hang out in front of Barns and Nobles or any other book store will be a day's adventure. You need what people want, not always what you want or like.
The hardest part will be making an eye catching query letter with a killer summary. I know some publisher/editors' like an outline of your book/story. That shouldn't be to hard because my editor had me put a summary of all my chapters at the beginning of a new chapter. That really helped me make sure my story was flowing and not jumping around.