you have one month to register your car, and two months to change your driver license. but the funny thing is that you must have your driver license changed before you go to register your car. So, in fact you only have one month to do the two things.
Changing driver license is easy, which takes 5-10 minutes, but registering your car is kind of annoying, you have to get all the following documents ready:
1. ontario driver license
2. safety check
3. emission test
4. insurance
5. the ownership of your car.
hopefully it helps.