I was considering to Drive a Cab before. And Oh yeah..driving cab needs good knowledge of the direct shortest routes, hotels, points of Interest etc. Nepali people are driving cab here in Chicago and making 500-600$/wk. But, you have to work @ least 12 hrs just to come up with lease and gas. And, if you work more rest is yours.
And Remember, Cab-Driving is the second most dangerous occupation in US according to a recent research. Retail stores workers come in first place.
i dont know about other cities but here in Chicago, You just need your Drivers' License and go thru two weeks class @ a college. After you pass the class and City Exam you will be issued a Chauffers' Lisence. No Questions asked about Work Permit.
A lot of students drive cab juss because it makes money and you are on your boss. No more Dhoti's schedule and kichkich.
Good Luck brother!