Most of the time I take decision by talking to customer. There is no contract/form to sign. I am working on it. As of now I ask to submit original Identity card and deposit of 10K. There has been an instance when I gave the bike to a customer without taking any security.
I am based in India. There is not much infrastructure to check the speed. You will find traffic police with such equipment only in cities. That too if you are lucky.
I had a motorcycle which I had bought for 126K INR. I was not using it much except to commute from home to office. I was going to sell the bike, then suddenly this idea clicked. It took few hours to make and host indiarider.com(people can take the bike on rent). Its been two months now, I have made 15K till now, 7K last week.
Currently I live at rented room on roof top of a residential building. Temperature of my city(Bangalore) is around 22 degree centigrade(http://en.wikipedia.org/wiki/Bangalore#Climate), mostly cloudy. I have setup a table with four chair outside on the roof. I find it pleasant to work outside mostly during morning and evening. In day time if its cloudy and little wind, I feel better working outside.
I use macbook and sublime to do my work, light reflection sometimes blurs the text, but it is mostly tricky, I try different position and get it working. It's little difficult to work outside during sunny days.