To create a new Flutter project from the Flutter starter app template:

In the IDE, click New Project from the Welcome
window or File > New > Project from the main IDE window.

Specify the Flutter SDK path and click Next.

Enter your desired Project name, Description and Project location.

If you might publish this app, set the company domain.

Click Finish.

Setting the company domain

When creating a new app, some Flutter IDE plugins ask for an
  organization name in reverse domain order,
  something like com.example. Along with the name of the app,
  this is used as the package name for Android, and the Bundle ID for iOS
  when the app is released. If you think you might ever release this app,
  it is better to specify these now. They cannot be changed once the app
  is released. Your organization name should be unique.

Creating a new project from existing source code