Well, with Anoop's help I managed to run the test application BUT
EVERYTHING is working ONLY in command line. ALL the commands are not working in AndroidStudio.
For example, emulators work there but Flutter doesn't see them through the studio, only if I run the emulator in the command line.
Seems like "Get started" really needs to be updated, first variables issues, now it doesn't work in the studio at all...
How to make it work in AndroidStudio? That is the question...