Currently installs flutter latest tagged version in flutter/flutter github (https://github.com/flutter/flutter)
$ brew tap eclewlow/formulas
$ brew install flutter
or
$ brew install eclewlow/formulas/flutter
flutter-sdk path will be
/usr/local/opt/flutter
dart-sdk path will be
/usr/local/opt/flutter/bin/cache/dart-sdk
You still need to install Xcode and Android emulator, etc.
https://flutter.io/docs/get-started/install/macos
And create your project pubspec, etc.