vs code and dart language

Where to get Microsoft VS Code: https://code.visualstudio.com/download

Select the correct download for Intel, Apple silicon, or both.

Documentation: https://code.visualstudio.com/docs

For assistance with Dart: https://dart.dev/

Here is how Dart describes installing via a Flutter SDK install: https://dart.dev/get-dart

Given your environment here is tied into Microsoft tools and also using Google cross-platform tooling and with Google Flutter involved, this forum—based on previous postings—is unlikely to have folks with a particular depth of experience posting about that. Cross-platform is always going to be different too, as your development and your apps are centrally dependent on the cross-platform tooling, and not on the native platform and tooling.