Answer:
If your only talking about the app store then you program your app and when it is finished you submit it as an Apple developer and pay $99 for the app to be up.
Steps of what to do for submitting to the App Store:
- Assemble App Store Information.
- Create a Bundle Identifier.
- Create a Certificate Signing Request.
- Create an App Store Production Certificate.
- Create a Production Provisioning Profile.
- Create an App Store Listing.
- Make The Release Build
- Fill In Version Information
- Submit Version For Review
- Release
hope that helps you out homie and good luck on your app bro.