Congrats on finishing a book. That, in and of itself, is no easy task. I've dabbled in writing, had a couple short stories published on e-zines for token payment, but nothing remotely major. I've been working on a supernatural suspense novel for about the past year but have bogged down after about 45,000 words. It was great at the start, when the idea was new and the motivation was there, but it definitely gets tough in that dreaded middle stage.
You should check out The Lounge subforum. They do writing contests every now and again. It's fun.
Here's the thread from the last one, which I happened to win
(shameless brag, couldn't resist). Mine is the story entitled "Your When".