What kind of voice acting are you referring to? Doing commercials, educational materials, anime?
1. You will need a demo and a manager. Find independent record labels where you live and ask them if they can recommend anyone with studio access (to make your demo). Or put a wanted ad on craigslist.
2. Natural voice talent is the very first tiny step. You will need to speak clearly and quickly. Try repeating commercials as you listen to them. Write ad copy and try to say it increasingly faster without compromising quality.
3. Research vocal exercises and do them daily.
4. You will likely need some form of training. I took a course from someone who had been in the business for decades. There are a lot of 'scam' courses so do diligent research when making a choice.
If you do not have a background in acting, it is probably wise to pursue some theatre classes. Preferably with a 'voice acting' bent. This is especially important if doing anime or cartoons so that you know your marks and how to read scripts when you come in.
5. Time is money. A Director will ask you for more takes but they prefer someone who "gets a feel for it" off the bat. Vocalize constantly. It doesn't matter if people think you are crazy for talking to yourself. The more prepared you are, the higher the chance of a request to return.
6. The more versatile your demo is, the more successful you will be.
7. Once you are working, there are various options available. If you do anime or other cartoons, you will likely go to the studio's to work.
If you want to record educational materials, audiobooks or commercials you will need your own studio.
I have one friend who does primarily commercials and cartoons. He lives in a high-end neighbourhood and has several luxury sports cars. His studio is worth a considerable amount.
My other friend lives in Portland and travels a lot to do manuals, audiobooks, corporate materials etc... But, he still has a home studio set-up. His is considerably less expensive (under $25,000). {My point is that there are different salaries and lifestyles if you choose this as a career.}
Here is a view of his simple workspace:
8. You will need to be able to market yourself. Initially to a talent manager and then to clients.
All the best!
