git doesn't really require a remote repository, so if you start a new project and just let QtCreator initialize git you should be fine.

If you work on an existing project from a remote repository then the initial clone will setup everything and you just work with that from QtCreator.

However, I am not the best person to ask as I am doing all my git stuff in a terminal, not relying on any integration other than maybe automatically adding newly created files from the "new class/file" wizard.

Cheers,
_