One of the ways you can make money with your app is by charging advertisers. The advertisers will be paying you to put their brand in front of your big huge audience.
But in order for this to work, you first need a big huge audience.... and right now, chances are that you probably don't have one.
If you want to make advertising business models work, you first need to grow your audience for 6 months to 1 year, which means that advertising business models are usually not good business models for beginners.
At Apps Without Code we recommend you consider advertising as a business model down the road when you have 2000+ customers. Until then, we recommend you consider other ways to make money with your app.
Read this article about white-labeling to learn about other ways to make money from your app idea immediately.
Anything else?
Feel free to send us a message at support@appswithoutcode.com