vagrant up
сделать нужно.Ну а вообще symfony.com/doc/current/setup/homestead.html
Мне больше импонирует docker-compose up -d
Да, Homestead никак глобально не настраивается.
Instead of installing Homestead globally and sharing the same Homestead box across all of your projects, you may instead configure a Homestead instance for each project you manage. Installing Homestead per project may be beneficial if you wish to ship a Vagrantfile with your project, allowing others working on the project to simply vagrant up.
про "сменил папку".