If you are listing on .ca you can chose to use calculated shipping on the sell your item form and then just enter weight, dimensions etc. You'll also have to enter the service and you might want to look at the different requirements and options for each service on the CP site. If you are using lettermail you will need to use flat rate shipping as the calculator doesn't work for that.
A quick overview:
Within Canada
Expedited parcel is often less expensive than regular parcel and a day faster so most of us use that. It includes delivery confirmation.
If your package is less than 2cm thick and not too expensive you can send it within Canada by lettermail. No delivery confirmation of course but many sellers do use it for smaller less expensive items and don't have a problem but it depends on your risk tolerance.
To the US
small packet USA- no delivery confirmation but least expensive method
Tracked packet USA - delivery confirmation, for items under 1 kg
Both TP and small packet are based on weight and have one rate for each weight group within the US regardless of distance so using a flat rate is also doable
Expedited parcel USA - delivery confirmation; more expensive than TP in most cases. Note that if the minimum dimensions for small packet are smaller than for domestic package so the calculator won't work for the US if your dimensions are less than 21cm x 14cm x .5xm
If you want to list on the US you'll have to figure out a rate based on the CP calculator on their site. https://www.canadapost.ca/cpotools/apps/far/business/findARate?execution=e1s7
If you set up your small business number on Shippo or Paypal you will get a small discount on some services. Be prepared for sticker shock though..shipping here can be expensive.
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