If there's any money to be had in property ownership, it comes directly from the tenants who pay their bills on time and treat your property responsibly. Find them in five places you should definitely be advertising:

1. Property listing sites online. Do a Google search for rentals in your city, and see which property listing sites pop up first. Advertise there, and provide an outbound link to your site.
2. Your own web site. Use lots of visuals on your home page, and don't miss this chance to build a community full of blog posts and links to local resources. Include a direct external link to specific listings on every print and online ad you post. Post new content at least weekly, and be sure to include all social media plug-ins and a Twitter feed on your home page. Engage current and potential residents in conversation through social media.
3. Video. Put together a video tour of your property and post it on YouTube or Vimeo. Embed that video in your web page.
4. Newspapers. Many people who are actively looking for a new place to live will still look through local classified ads first. Maximize your print advertising dollar by sticking to Sunday papers only, and make sure your ad will appear on the newspaper's online classifieds.
5. Craigslist. The ads are free and give you almost unlimited space, but keep the ad short so that your attractive, full-color photos pop up near the top of the screen and entice your next great tenant to keep looking. Provide a link to your web page, and give all contact information above the photos in the ad: you don't want the viewer to have to scroll much to take in all the vital information. Craigslist favors text ads over HTML, and you'll get blocked if you try to post every day. Just update your ad instead to avoid being labeled a spammer.