The most crucial step is to ensure that you set your goals for your ad campaign first. This is how you will be able to understand, track and measure your metrics to know where your ad is performing or not. The most common goals that you can set for measuring your success are the following.
 Your ad impressions
 Your ad clicks
 The expected click-through rate
 Your average cost-per-click
 Conversions as a bidding rate
Once you have established your campaign goals, and you have launched your ad campaign, it is important to do routine maintenance such as product A/B testing.