Take classes for voice-over training. The classes teach you how to use your voice to make your character interesting, as well as how to project your voice. Just as movie and television actors often exercise their bodies, voice actors must exercise their voices. Instructors teach students exercises to protect their vocal cords and things not to do, such as screaming. Some classes even teach you how to do different accents. Numerous community colleges offer voice-over classes or weekend workshops.
Watch animated television shows. Listen to the voice actors to see how they give characters different personalities using their voices. Focus on shows where one actor may be playing more than one role. Animated series like "King of the Hill," "Family Guy" and "The Simpsons" have several cast members who play as many as five characters, all with different attitudes and characteristics.
Make a demo tape at a professional recording studio. Your tape should consist of at least five different voices, 10 to 15 minutes in length. If you can mimic different accents, know multiple languages or know how to sing, make sure to feature these talents on your demo tape. You may want to record different emotions, such as happiness, sadness, excitement and surprise. Even if you make a general demo tape, you may have to prepare a new tape geared toward the character you are auditioning for on the animated show.
Get a voice talent agent. An agent helps you find credible voice auditions. To find an agent, first look in your city for talent agencies that take voice actors. If you don't have agencies in your local area, look at online resources like Voices.com for respectable voice-over agents. As with any job, send a cover letter and resume, even if you are a newcomer, and a copy of your demo tape. Some agencies allow you to send your tape online. When you get an agent, maintain regular contact with her, letting her know what type of animated job you want.
Research your character. Like other actors, voice actors should research their characters, if possible. Your agent may be able to give you a copy of the script. Figure out what kind of voice you want your character to have and play around with different voices.
Be professional. Even though voice work is not based on your appearance, you should still dress professionally if you have to appear before people associated with the show. They are more likely to take you seriously if you dress in a nice pair of pants or shirt and have clean, coiffed hair. If you are promoting yourself online, make sure your Facebook and Twitter accounts don't feature questionable materials.