I am not sure about the insurance - good question. I feel certain all questions regarding being a driver would be covered here:
Sign Up to Drive or Tap and Ride | Uber. My wife and I have used Uber in more than 10 countries. Every driver has been polite, friendly, and happy with their job (usually part time). The cost is usually much less than a classic taxi, there is no exchange of cash at the end of the ride, no tipping, etc. - a real displacement technology all controlled with your smartphone. Extremely simple.