There are lots of ways to get voice acting work, from online sites such as Bodalgo.com, Mandy.com, Voice123 and Voices.com. These are known as pay to play sites. They have lots of opportunities for you to audition, but it is highly competitive. Looking locally for businesses, including radio stations, that need voiceover is also a good way to start.
Also listen for sibilance. Strong 'ess' sounds are best corrected at source, by using good mic technique, but sometimes they're unavoidable. If you hear an 'ess' that really sizzles in your recording, you can manually reduce its volume. You can, of course, also use a de‑esser, but do be careful, as applying some de‑essers to the entire audio file can alter the sound of your recording. It often works best to apply them to short sections, either offline or using automation. My preferred de‑esser plug‑in is the one sold by Eiosis (www.eiosis.com),Make sure you record some silence at the end of each take. That way, if a great performance suffers from noise issues, you have something to feed your noise‑reduction processors. Just don't rely on this technique too much! which cleverly separates the esses from the rest of the audio and allows you to manipulate them independently. If you want to learn about some more advanced strategies for de‑essing check out Mike Senior's article from SOS May 2009 (/sos/may09/articles/deessing.htm).
As the engineer, your key job is to select and set up the recording space, choose and position the microphone, set levels and make sure you're recording a good, clean signal at a healthy level. Like music, the louder the signal you want to record, the less audible the noise floor, but you don't want to have to speak louder than sounds natural, and you don't want to overcook things when tracking: any distortion will be very noticeable on an exposed voice part, and an otherwise great take with digital clipping won't be acceptable. If you notice clipping only when you start editing, software clip restoration tools might help to make the take usable, but it's not going to be perfect. Remember that although you may have needed to record 'hot' on analogue tape and older 16‑bit digital recording systems, modern 24‑bit A‑D converters can accommodate a much wider dynamic range, so you no longer have to track so loud: you can leave much more headroom.
The annual income of a voice talent varies greatly from person to person and from year to year. When you’re just starting out most of what you earn from voice over work should be reinvested into your studio, demos, and marketing efforts, so at this stage you will need a second job to support your daily living expenses. Once you start building a portfolio of clients, you’ll see your regular earnings grow and will really start to get a feel for the potential your voice over business has. In time, you’ll be enjoying a satisfying career.
If a client likes your demo, they may invite you to audition. In the 21st century, you can download the audition script, record the audition at home, and then send the results to your client over the Internet. Prepare yourself for a life of constant auditions: Even successful voice pros may do many more auditions than actual jobs. But if enough jobs come your way, it's worth it.

One of the most important rules is to ensure you value yourself as a professional. If you undervalue your own service it can be hard to later charge for the correct rates. A professional voice-over should cost a minimum amount, even if you’re new. If you allow clients to low-ball your work from the outset it will continue to set the expectation that they can get a voiceover from you on the cheap. This can then mean the difference between making a living and paying bills or not.
"When recording voiceovers at home, you have to focus on performance: keep your energy levels up, stay true to the page, pronounce words correctly and consistently, and make sure you keep to a schedule to make the deadline. Prep well so you don't waste time second‑guessing yourself, looking up words as you go, and remember to not over‑ or under‑direct yourself. Also, make sure you know your recording equipment and room well; being able to quickly make adjustments to mic placement, levels, and so on, will make you more efficient.”
A great performance recorded on mediocre gear will always sound better than a mediocre performance recorded on great gear. By preparing well, before the session, you'll find it far easier to relax and focus on the message and the listener. As a producer, it's important to be clear what the expected format is for the final audio file. Although there are certain 'standards', your clients' expectations will vary.Read through the script, look up any questionable words and check their pronunciation. For American English, which accounts for the majority of my work, my favourite pronunciation resource is the Merriam‑Webster on‑line dictionary (www.m‑w.com), which includes audio examples. If you don't know how to pronounce the name of a company or product, call the company's customer service centre (if anyone can pronounce it right, they can!). If you don't know how to pronounce the name of a person or city, try searching YouTube for news reports on the subject.
At this point — unless you're tracking for broadcast applications (where they don't work to peak levels) — consider 'normalising' your recording to an optimal level. Normalisation can be used to push the loudest peak to around ‑1dB and increase the volume of the entire recording by the same ratio. Of course, you can also tighten up dynamic range (the difference between the softest and loudest parts of your recording) by manually reducing the loudest sections of the recording before you apply normalisation. On a final note, if you do plan to use a compressor, then you might as well add gain at that stage instead of normalising. 
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