How much would insurance cost if my first car was a 62 impala sedan?

depends on where you live, if the car has value,,if you have traffic violations, etc

We can't even guess because we don't know your age, we don't know where you live, we don't know if the vehicle will be garaged at night, or in a driveway, or parked on the street. We don't know how much driving you might do per day, week or month. or for what purpose. We don't know your driving record or how long you've had a license. We don't know the value of the vehicle based on its condition, and we don't know whether you want just liability coverage or full coverage, the level of coverage needed, or what additional riders are necessary, such as for uninsured/under-insured motorist coverage, glass coverage, etc.

Obviously you're clueless about insurance but next time try to engage your brain before blurting out a question that is useless without sufficient information. Bottom line, only an insurance company can answer your question accurately, but I can tell you this: if you are under 18 you cannot get your own policy because an insurance policy is a type of contract and federal law prohibits anyone under 18 from entering into any sort of legally binding contract. The vehicle must be insured by someone over 18 and you must be listed as a named-insured driver on their policy.