Brian Rauschenbach put together an ad copy worksheet template that marketers can use to develop new ad-copy ideas and best practices. He takes us through the process of effective A/B ad testing and best practices. One example defines what it means to localize an ad by creating a "geo ad group," and picking a city to set the location. Rauschenbach suggests running only one ad against what he calls the AdWords campaign, making it easier to test ads.