A demo recording of you doing voice-over work is your CV and your business card combined. If you're applying for a voice-over job, you can send the potential customer your demo via the Internet. Ideally you have multiple demos for different types of gigs. For commercials, clients want to hear 60 to 90 seconds of voice work. If you're auditioning as an audiobook reader, five minutes of demo proves that you can stay in character over a longer stretch of time.
"This was Alfre Woodard's audiobook directing debut, and she pulled an amazing performance from people. The big [thing] was to remember that these stories were being told in intimate settings, one‑on‑one in most cases, so the talent really needed to speak to the individual listener. An image kept in mind was stories being told around a campfire, back when folktales were passed down by spoken word.”
It's only after this sort of processing that I'll start cleaning up the recording and dealing with the gaps of silence between spoken passages. A noise gate (or an off‑line 'strip‑silence' function) can be used to automatically mute sections that fall below a certain level. However, if not used carefully, these tools will clip the 'T's and 'P's off the ends of words, and shut out natural breathing sounds. Worse, if your recording is noisy, a noise gate will actually draw attention to the problem, since your client will be able to hear the difference between room tone and absolute muting. Another trick is to use a downward expander to reduce the noise floor of quiet sections, rather than cut out the noise completely.
Hey Rob. You certainly know your stuff. I know this for a fact, because I’ve been a working professional at this for nearly ten years and spend every week since that time making mistakes and learning from them. I also incorporate 99 percent of your suggestions here and believe it folks they work, if used properly. Very informative and practical. Thanks, Rob.

You need to appreciate that there is a lot to learn and do before your first paid voice acting job. Yes, you want to get out there and start auditioning. But first, you’re going to need proper training, equipment, resources, and yes, some natural talent. The great news is that even though the voice over industry is competitive, there is plenty of voice over work out there for everyone. This guide on how to become a voice actor will give you a good idea of where to start.

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.