If you haven’t installed Flutter Framework, please follow this tutorial
How to install Flutter on Mac.
1) Open the terminal on your Mac and cd to the directory you want to create your Flutter project.
flutter create ff_tutorial_2
ff_tutorial_2 is my project name, you can use whatever you want. Your terminal should print something like this.
2) Open the project with Visual Studio Code, if you have Dart Code plugin you should see running simulator or device name on the right-bottom of the editor.
3) Now open terminal again or use Visual Studio Code terminal and type this
Your first Flutter project will run on the simulator.