Need Advice for Ads

Hi guys,
Im new to this digital family. Recently I was planning to buy an app template from CodeCanyon and mix it with my own app, the app will be for iOS and Android device. I need advice from all of you who know how to calculate the revenue based on the ads. How much I can earn from the ads shown in the app? and which provider is the best to choose as ads partner, iAds, Admob, revmob or what you can suggest to me?
Thank you!

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