Signing Up For Legiit
This is a bit outdated and the site looks a whole lot better now, but this will give you the general idea.
You can get more updated instructions at http://legiit.support
Legiit: https://legiit.com
Full Playlist: https://www.youtube.com/watch?v=E6XqxyJ5p6o&list=PLnfdiqFaBu3XjjVNVzJIowKV324_ou0YI