You can view reports about your ad campaigns after display of your ads has begun. Click on View statistics on the campaign page. This data will help assess the ads generated and user queries for which they were shown.
In the Search qeuries report, for example, you can see the queries for which your ads appeared. You can use negative keywords to exclude ad impressions that are not applicable to your offer. You can add them on the page where you edit campaigns or ad groups.
More information about campaign statistics.