What exaclty are the purpose and definition of INSURANCE?

BEST AUTO INSURANCE?????????????????????...
Im just curious and 17 yrs old
I have Geico right now. I am a 17-year old child that has a vehicle accident on his record (in july 2010).
I saw my father right a search for my ranger for the insurance area for $75. im planning to obtain a 2003 mustang. How much will it charge for that on estimate simply responsibility and it will be on my parents  insurance   ? Im 16-year old man having a 3.0 gpa. I've my own personal career too.
"In case you have no  insurance  to include different driver how can you discuss with auto insurance organization after an accident