Start networking. Long story short, you won't become a director without a reel. That is the most important thing to have. That being said, this is definitely an industry where it's a lot easier to show said reel if you have an in. To get an in, you need to start networking right away. The more people you know, the more opportunities you will have. Attend industry events, such as mixers, conventions, parties, premiers, etc. Introduce yourself to people and try to develop good relationships with the people you meet. Offer to help out on future projects or invite others to work with you.