Join a writing group (either on-line or around a real table–or both). Travel, when you can, to writing conferences where you will meet interested (and interesting) fellow writers, editors and agents. Perhaps you will make a connection at a conference that will lead to an invitation to submit your work. Make note of the houses publishing books you admire. Consider how your work might fit with those publishers’ lists. Let editors know why you would like to work specifically with them. And keep writing! If you spend all of your creative energy waiting to hear from editors you will miss the opportunity to perhaps generate something even more exciting and polished than your present project. So get to work on your next manuscript while your first one is out to market. I wish you all the best of luck in your quest.
Readers often comment, “I’ve written a book. How do I sell it?”