wanting to buy used pedicab

hey i am looking to buy a used pedicab perferably a 21 speed. any
advise or things to look out for just off the top of your heads. i am
a college student and i need part time work for the summer. please
advise. anything could be helpfull. also if anyone knows how much
insurance i need to do this kind of business and or licenses in
florida. i have ordered a book on starting a bicycle based business
but i need as much info as possible. i am allready riding 10 plus
miles a day and my butt needs more pedal pushing. garf cooper