hey there, to answer your question, i'm pretty sure your dad would have to get the insurance, and add you to the policy. also all state is the cheapest that i found, but the rates depend on things like age (15-25 is the worse), size of motorcycle ( 600cc or less is cheaper ), sex ( girls are suppose to be safer ), the msf safty class ( takes 15% off ), and also the style of bike ( sport bikes are more expensive than crusiers ).
being a 15 year old guy without a license, trying to get insurance on a sport bike

. sorry dude but you quallify for the most expensive rates.
anyways it doesn't hurt to try, you never know. if you you get a good agent willing to work with you, you might be able to get someting decent. if i were you though i wouldn't expect anything less than 1000 for 6mo.
good luck and hope it goes good for you:smokin