Review your test ad and ensure it meets the conditions to serve on your test environment ( correct catalog, correct SKU, and correct search term).
Once you have completed the Ad setup process you will reach the review and confirmation page. Here you will be able to see all the settings that you have selected before activating your ad campaign.
Launch your campaign. You can go back and edit any part of your campaign before submitting by clicking the "Edit Campaign" button underneath the "Launch Campaign" button.