Attend voice classes. Working with a voice-over coach and attending classes regularly will help broaden the range of your voice and make it more versatile. Set aside a slot of time daily to practice and improve your skills.
Create a voice demo. A demo of your voice is needed for your auditions. Book some time at a professional recording studio. A high-quality demo gives you a better chance of getting roles. There should be 2 to 5 tracks on your demo. You will need a script to show the versatility of your voice. Make up your own or use one from an advertisement. Your first track should be preformed as wild lining. Wild lining is when you read one section of the script numerous times using different tones and enthusiasms. The second track should be of you reading the same script all in one sitting. There is room for more tracks. Use different voices to show your versatility. If you're capable of sounding like a child or sounding older than you are, show off those skills. In addition, if you are capable of voicing for a cartoon, include a track of your cartoon voices.
Find an agent. An agent can get you more auditions and introduce you to important people in the business. To find an agent, apply within the appropriate acting agencies that represent voice-over actresses. Agencies have different application guidelines. They usually ask for a resume and a demo. It you don't have a professional demo, it's okay to send a self-recorded demo. If the agent likes what she hears, she will call you in for an interview.
Go to auditions. Never be late to an audition. Being late is solicits an automatic no from the casting director. Always have several copies of your resume and your demo on hand. Most importantly, be confident. Appearing shy or nervous might hinder your performance when auditioning.