Check carefully the website of that company and the technology they are using. This is necessary as it will help you to know how the company or the agency will deal with your business and what type of strategies they will make for its promotion. Check the previous history or to say portfolio of the company. The company should not be interested only in earning or taking money from their clients rather they should take strong initiatives to improve its online presence.
It is recommended that the company should have the knowledge of PPC management. This is because it would provide them an idea of market competition. They must have a transparent nature so that you can get the details of progress and current status of your campaign. So, choose the best to get the best results.