How old----generally 18 to open any type of formal business. However the amount of equipment and capital needed to open a whole new station is in the millions and I dont think there are many 18 year old who can afford that.
      Answer1:18--the minimum age needed to contract. PERIOD.if you instead, limit yourself to creating an internet radiostation, there is no limitions re age.
      Answer2:IT Job- http://jobsbandhu.in/
      Answer3:There is a site that has a bunch of information on business given from industry experts and other successful entrepreneurs. If they dont have it they will try to help you find the information you are looking for. We use it at my college it wont let me put a link but search: Business Empire Magazine