Our recommendation is to start small and reinvest the money you make into upgrading your equipment and set up. All clients, whether they are Pixar or just a guy who needs a voicemail message, expect crystal clear audio recordings. You absolutely MUST be recording in a professional recording environment with professional equipment. They are NOT going to settle for less than perfection. Does this mean spending thousands of dollars? Maybe, eventually it does, but not today. What you’ll need to get started:
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.