In late 2009, my wife Simone received an email from Prague in the Czech Republic. The sender, Mirek Jirku, was heading up a project to record voice messages for the foreign‑language versions of the latest Avast! anti‑virus software. Mirek sent us eight messages to be recorded, specified the fee and deadline, and requested a slow, friendly read. He asked us to send separate stereo MP3 files (at 160kbps or higher quality) for each message, specified that we'd have to sign a non‑disclosure agreement before recording, that we'd need to invoice afterwards, and that he'd pay via a wire transfer instead of PayPal (which is often used for international payments).
The quality of your voice over depends almost entirely o the skill of the voice actor you use. A good voice actor will have perfect enunciation (ie, be very easy to understand), speak at an ideal pace (not too fast and not too slow), and have a pleasing voice. They should also be good at acting, and able to convey the feeling or emotions required by the script, using vocal variance and tone to keep the words interesting while also embodying the desired mood.
First, since you’ve decided to use professional talent rather than record your own voice over, you know the challenge is to find a person whose interpretation of your script and voice quality represents your brand. You might have a list of qualities — female or male, a mature or childlike voice, a certain accent, authoritative, and so on. This is your voice profile. It’s best to start with this list already defined so you can easily narrow your results.
Perhaps you come from a corporate business background, but you have a remarkable capacity for accents and original character voices, or you’ve been in radio and broadcasting for a number of years. If you’re an actor looking to expand your employment opportunities, mastering voiceover is imperative considering it’s required in every manner of recorded media: film, TV, animation, games, corporate industrials, and commercials. Whatever your specific experience has been to date, getting started in voiceover most often requires the following: 

3. You need a simple, reliable, home-recording setup. Keep in mind: Your objective is on being the best voice talent you can be, not the best production studio or recording engineer. Nevertheless, you do need the ability to record, edit, and turnaround a proper audition. Do not run out and purchase a mic! You can’t return it, for hygienic reasons. Besides, there’s a bit of a learning curve to this and recent industry advances have made having a home “studio” easier and more affordable than ever before. You could have the best gear and the coolest toys on the block, but if you can’t use them it’s a waste. (Tip: What you’re recording on matters less than where you’re recording. Find a quiet place like a closet full of clothes to record in.)

As editor, you need to turn the raw recording into the final version of the file you'll be sending to your client. Editing during a recording session can be problematic, and particularly so if you're recording in a domestic environment. How can you expect to hear the drone of the dishwasher ruining your recording if the dishwasher is still running as you edit? I'll look in more detail at setting up a voiceover recording studio next time, but for now, if recording in a separate room or isolated booth isn't an option, at least try to edit the file the following morning (or maybe at night) when there's less noise around — because hearing your recording with a fresh ear and in a quieter environment will help you to make better editing decisions, and will reveal noises that slipped your attention earlier.