
First, find out about their experience with apps development for iPad. The Apple's iOS operating system is difficult to work with, and the odd screen size of the iPad can make apps development difficult. This is the reason why, the first thing you need to do is find out a company that has considerable experience developing apps for iPad.
The next thing to do is check whether they are capable to develop apps that match your business segment. For instance, it would be illogical for a financial institution to get their app created by a company that is specialized in developing games. That's why, approach a company that specializes developing apps specific to your business type. The portfolio of the company could be helpful to determine whether they specialize, creating app related to your business or not.