Its up to you if you want to get an Ontario business license (business number)
you can use this business number on your receipts instead of your SIN number as long as you are willing to give your SIN number to CRA if they request it.

I got a Ontario business licensed as I feel that it show I am a professional in the business for the long hull. But its not required.

You can register for a Ontario Business Licensed at Service Ontario

you are not a corporation, you are a Sole Proprietorship since yo are the only owner of your business.