Everyone knows that a taxi driver from every passenger he drives home safely. For sure, any passenger that is not satisfied with the service won't ride on that same taxi again. When that happens, the driver's income is affected and so is his family.
Drive your taxi around the town and look for passengers. You would know where to go since there is an arrow that will guide you through. Sometimes, you need to collect money on the road. There are times that you need to reach a certain amount to be able to go to the next level. Each level's requirement is different.