I understand you need help with integrating Facebook interstitial and banner ads to your existing app. I have experience implementing ads because I've implemented ads to my own apps that are currently live in the Appstore. I have worked with Admob, Chartboost, iAd, Flurry in the past, to name a few. I haven't worked with Facebook ads before but the implementation should be similar. I just need to get my hands on the Facebook SDK and I should be good to go.
I have also worked with Xcode, Objective-C and Swift so IDE/ programming language is not an issue.
I would need to know the Xcode version you're using and I would need access to your project so that I can look at how your current code is structured so I can plan things out. I would also need to know where you want the banner and interstitial ads to appear.