Before doing so, you should go to the Newbie Manual which you'll find linked on this page.  Look for the red and white life preserver.  

Read it over and if you still have questions, feel free to come back and ask

...be sure to follow them carefully. Your ad should go on the ad board for your area. Do not post an ad on your regional discussion board it will be removed by TER board admin. Ads are only allowed on regional ad boards. You can post an ad once every 7 days. Not once a week, but once every 7 days.

Check the link below for details.

BTW: this link takes you to the Ad information in the Self-Help Center. You can find the Self-Help Center any time by clicking the site map link at the bottom of any page. Look under the Info & Policies heading and click the Self-Help Center link which is listed there.