Download Flutter SDK, extract the "Flutter" folder and put somewhere on your machine https://flutter.dev/docs/get-started/install
Add path for 'location/flutter/bin'
flutter doctor
https://developer.apple.com/xcode/
sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
sudo xcodebuild -runFirstLaunch
open -a Simulator
https://developer.android.com/studio
flutter create my_app
You should now be setup to start editing the lib/main.dart file and build your app
Re: "#3 Check Dependencies" -- if "flutter doctor" tells you that the dart and flutter plugins are not installed in Android Studio, that may be because Android Studio changed the folders for plugins. See the post from user "lost-and-found" on SO: [https://stackoverflow.com/questions/64369971/android-studio-dart-and-flutter-plugin-is-not-installed].