Your business address can be your home address.
If you are registered to collect GST/HST, then you can sign into your CRA Business account to check what your number is. If you aren’t registered, then you won’t have a number, and isn’t needed on your tax return.
If you have TurboTax Live Assist & Review, here is how to talk to a Tax Expert: https://turbotax.community.intuit.ca/community/navigating-turbotax/help/i-m-using-turbotax-live-assist-review-how-do-i-talk-to-a-tax-expert/00/873764