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Before running the setup process, you will need an empty SQL or Mongo database, so fire up a new database using your favourite database service.
Gravity uses Mailgun for sending transaction emails to users, so go ahead and register a free Mailgun account and set it up. Please refer to the Gravity Server Installation instructions for more information.
Using Expo without a developer account, you can run your app on your simulator or device. However, if you want to publish your application to the app store or invite Beta testers to install it on their device using TestFlight, you'll need to join the Apple Developer Program, which costs $99 per year.
To run your app on the Android simulator, you'll need to download a free copy of Android Studio. Publishing your app on the Google Play store requires registering as a developer with a one-time fee of $25.