Do i need insurance to hire 16yr old to work on my farm?

I am 17. I simply got my certificate. I will be put on my grandmas insurace. She has one-car. We intend to discuss that till I will get my own. The car is actually a 1995 sc400 lexus. Howmuch do you consider its likely to become a month?!
"The problem is the month my COBRA medical  insurance "> insurance     will probably come to an end within my