Welcome to GTAM. Lots of good advice has been given regarding taking the riding course - you'll learn things that can and may very well save your life one day.
Regarding insurance, always call for quotes *before* buying anything. MC insurance in Ontario is crazy expensive and a lot of people find out the hard way that they simply cannot get insured (or can't get insured for less than an insane amount of money every month) on a motorcycle they already bought. Best to go in eyes wide open first. The key is buying a reasonable starter bike.