Once you have created a zone you can display ads from any linked campaigns on your web site. This is done using the Ads Display container rule.
Firstly, you must create a template with which to display the ads. There is a sample template you can base your template from. Keep in mind that you can choose to display multiple ads at once, so you should account for this in your template.
Next, add the Ads Display container rule to your web site. Select which zone to display and also your newly-created template.