You've written your book, it's published. Now what? Do you sit around and wait for readers to find it? I hope not. There is a vast resource out there for you and it's sitting at your fingertips. Social Networking. It is the life blood of aspiring authors everywhere. You say you don't know anyone.
Step into cyberspace. There is Facebook, tell everyone you think you know. Join twitter and follow those who follow you. Join writing groups like Goodreads and She Writes. Go to Google+ and Stumbleupon. There is a platform almost anywhere you look. You just have to look.
Good luck and happy writing.