There are a few options when it comes to monetizing your app.
Decide on the approach early to help plan out the next stages.
Here are your options:
- One-Time Sale - A one-time cost for the app.
- In-App Purchases - Will you give it away for free but charge
for more functionality or content within the app?
- Advertising - Using display ads.
- Lite version and full paid version - Will you offer a free
version and include a paid app alongside the free version?
Here is a bit more info from the Apple Developer
Program
I've also attached a great guide to App monetization courtesy of
DesignBoost.net in the
resource tab.