As a beginner, it is vital to read as much material on bonsai. Internet is a great place... I personally like articles from evergreengardenworks.com. If you haven't been inclined towards growing plants in the past, then start with the basics of growing plants in general.
Also, getting acquainted with quality bonsai pitcures helps in understanding the design and artistic aspects of bonsai. The pakbonsai site has some really good pictures forum.
- Aman