Assuming you're looking for a teacher, I'd contact the school district you work for and see how they typically advertise for teachers. If you cannot use that option, maybe contact a local school district and ask where private institutions typically advertise for teacher positions. You could also post listings online at various websites.
Many websites, such as MONSTER.com are available for employers to search for qualified candidates as well as potential employees. Also, there are some organizations who have taken to social media to post jobs- such as TWITTER and Craigslist. I caution you to investigate prior to any posting or job interview.