There are many resources available to you including "trade papers", e.g. Back Stage. This weekly publication is available at newsstands in large cities or by subscription. You will find lists of anticipated productions, union news, tax tips and craft advice, etc.

Variety, also published weekly is essentially news about the business aspects of show business. It is not of much use for leads, but you can learn nuances about this business.

Ross Reports Television is a monthly publication that lists agents and casting directors; and gives information as to whether they will accept photos, videos, etc. It is available at most Barnes and Noble stores.

Ross Reports, USA lists all the agents in the country, state-by-state.