You can view ad campaign reports after your ads start displaying. Click on View statistics on the campaign page. If you check these statistics regularly, you will know how well your ads are performing to bring users to your site.
For example, you can go to the “Search queries” report to see the queries for which your ads were served. To prevent Yandex Direct from serving ads for non-relevant searches, use negative keywords. You can add them on the page where you edit your campaign or ad group.
To get detailed statistics on all your campaigns and evaluate the effectiveness of specific keywords and ads, use Report Wizard.
Read more information about campaign statistics.