Flutter Setup Guidance on MacOS

I'm seeking a skilled Flutter developer to teach me how to properly set up and run my Flutter application on both iOS and Android simulators on MacOS.

Key tasks include:
- Correctly configuring gradle.settings
- Setting up the correct SDK and NDK
- Running the application on both simulators

Ideal skills and experience:
- Proficiency in Flutter development, particularly on MacOS
- Experience with iOS and Android simulators
- Strong understanding of gradle, SDK, and NDK configurations

Please provide a step-by-step guide or walkthrough.