Choose in the Ad Status field before you click Create Ads. By default, the switch is set to Paused, so ads are created turned off and you can review them before activating. When you turn the switch on, the label changes to Active and the ads start running as soon as Meta approves them. A common approach is to publish paused, check everything with the Edit button on each row (it opens the ad in Meta Ads Manager), and then activate. Keep in mind that even active ads go through Meta's review before they run.