I believe statefarm is 4 years with full G licence, to get any motorcycle insurance through them... every company is different though... one company you will see alot is "Intact" insurance, which is who I am insured through currently.
I am a new rider aswell, just got my M1 like a month ago, did my safety course just waiting untill first week of august before I can go and claim my M2. I'm paying like 2,500-2,800$ a year for my bike insurance, they are still sorting some things out so I should get a multi-vehicle discount aswell which will bump it lower... I think its 2,600$ something currently. I don't have full G licence, G2... I'll be getting full G in august aswell which should effect my bike insurance to. I'm between the age of 25 and 30. I think once you get over the age of 21 there is a discount... and aswell at 25 possible... once your over 25 I think that the big one as far as insurance breaks.
Your definately better off starting on a small bike, the 250 or 300cc ninja/cbr's are great bikes to start on, especially when you factor in the costs of running them on an annual basis(insurance being one of the biggest cost, if not the biggest). You need to think about it like, that you need to build a history showing your a responsible driver, that you havn't had claims, that you havn't had many tickets(or the least amount of tickets you can manage) and as time goes by your rates will go down for a number of reasons.
But your in a bad bracket age wise, if you havn't had any suspensions I would look into companies that specialize in motorcycle insurance, get a few quotes... a quick google search brings up a bunch. If suspensions is more then 3 years ago your ok.
I can't say for sure but for a new rider you will likely be looking at anywhere from 1,500$ a year for a very small bike and a very clean record, up to 10,000$ for a very fast bike and a terrible riding record... you likely won't be at either extreme, but I wouldn't be surprised if the annual cost for a 250-300cc bike for a 19 year old could be 3000$ish annually. It kinda sucks for canadians cause cancelling the insurance during winter months won't make it any cheaper, and yet people in the US pay similar rates even if they can ride year-round.
The good news is, once you get older and have a bunch of experience, have had your full licence for awhile... your rates can get very cheap... like 600$ for a year or even cheaper on a 600cc+ bike. I"m not an expert I'm just repeated information I'v gotten from other, so feel free to take what I'm saying with a few pinches of salt....