Help build facebook app

We have an Android and also an Apple iOS app ready. We also have a facebook page for our product, and we have (partially) set up a facebook app for it, connected to the Android and iOS app. What we want to do is this: - Create facebook Adds and Campaigns, in a way that people can directly install the Android or iOS app from the facebook page. We want from you: - Help us check if our setup is correct - Explain us by writing step-by-step instructions how to publish a facebook posting / campaign that works as above