To legally drive in Canada, you will need a driver's licence. In Canada, provincial and territorial governments issue driver's licences. With a licence you can drive anywhere in Canada, but you must carry your driver's licence with you whenever you are driving. If you have a valid licence from your home country, you will probably be able to use this to drive in Canada for a short period after you arrive, but you need to find if this is applicable to your home country. Visit your local registry for more information.
The process of getting a driver's licence in Canada depends on the province or territory in which you live and on your driving background. You may need to pass a written exam on the rules of the road and also pass the driving test, you may choose to pay for driving lessons to prepare for the driving test.