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.
In a real way, Kelly Services practically pioneered jobs from home, since it began primarily as a temporary job service. It now works regularly with some of the very largest employers in the country, providing staffing needs at all levels. They specialize in accounting and finance, administrative, automotive, engineering, information technology, life sciences, and call centers, but actually cover a multitude of industries and job classifications.
After your initial training the real work begins. The best virtual assistants will scour popular sites such as Upwork and Freelancer, looking for work from home job opportunities and new job leads. Also, be sure to completely fill out your profile and list all pertinent skills. Potential clients can search for qualified remote workers and proactively contact them about potential job opportunities.