Once you've completed the set up flow, you'll be brought to the Dashboard.  You'll see an important alert notifying you to activate the Ad Campaign you just created.  You will also see this alert whenever you have no Campaigns running Ads on the search engines. 

It's important to activate your Ad Campaign to have your Ads start to appear on search engines, like Google®.  To activate your Ad Campaign, go to the "Manage Campaign" tab, under your selected Campaign, click the "Actions" button, and select the "Activate Campaign" link.