1.) Canada Post.
https://www.canadapost.ca/cpotools/apps/far/business/findARate?execution=e1s1
https://www.canadapost.ca/cpc/en/business/shipping/find-rates-ship/snap-ship.page
Get a Small Business Solutions card from Canada Post. It's on the website somewhere.
Worth 5% off many services and you will need it for SnapShip and Shippo (the other shipping service that works with eBay).
It does not give you a discount on LetterPost/LightPacket services.
And might I mention that you can buy discount mint postage stamps here on eBay, at reallynice discounts.
2.) Tracking is fraught.
No you don't need it, but it is a Seller Protection. Do NOT ever allow a customer to tell you they want you to ship untracked. You will not see your item or your money again.
But I ship most of my items without tracking, including internationally.
To ship with tracking can move a CD or paperback from a $1.20 postage cost to $15.
So you have to balance your costs (procurement, fees, postage, packaging) against your chances of fraud.
And that depends on your category.
I sell books, sewing patterns, stamps, postcards and emphemera.
A demographic that reads and enjoys following instructions. Losses are minimal.
A seller of coins, sportscards, dolls, horsetack, or jewelry would have a different customer base.