While most of these companies advertise that you can earn upwards of $18 or so an hour, the reality is that you're not going to make that much once you figure in your gas expenses and wear and tear on your car. Also, work may not always come in consistently. I would recommend doing more than one of these if you really want to make it worth your while.
If you speak like James Earl Jones or Scarlett Johansson, quite a number of digital publishers (including game developers, animated film-makers, and training video producers) pay good money for voice talent and the time investment isn't too intensive—making this a great side business idea. You can find these publishers looking for voice-over artists on sites like PeoplePerHour, Freelancer and Upwork, as well as their calls for talent directly on their websites or through voiceover agents. If you do pursue this as a side business idea, be prepared to invest for the long-haul as it can be a very competitive industry.
I have a friend that is the city manager of a town of about 25,000 where his main task is processing requests for building permits. Actually a volunteer-type job, no salary. But he makes a bunch of contacts every day, and his address book is huge. So he is busy all year except the Holidays. To fill in this time he started a Christmas tree lighting service (houses, lawn ornaments, etc.). In this 3-month period he makes enough to keep him going the rest of the year.
Teaching and tutoring English as a second language is a great way to make a solid side business idea work, not to mention opening doors for you to travel the world if you'd like. While full ESL (English as a Second Language) accreditation is recommended, as long as you’re a native speaker, there are people in countries such as Hong Kong or the UAE who are willing to pay upwards of $25/hr for you to teach them English via Skype. Indeed, Learn4Good and Remote.co often have remote english tutoring jobs posted, check back frequently. Then once you land that remote job, you'll need somewhere more professional than your dining room table to meet with students—check out this post about how to find places to work remotely and you'll officially graduate this side business idea into a full-time endeavor for yourself.
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