<human>: Give me a shortened version of the text

I've been searching on the internet and keep seeing conflicting or incomplete facts, so I am posting this here. If this isn't the correct sub, please let me know which would be better.

I'm planning on buying wheels and tires from the US. They are being shipped from California and I live in Toronto, Canada. I got the price + shipping for the address here in Canada. I'm waiting on the shipping estimate to Detroit. Depending on that, I'm going to make a decision and driving down to Detroit shouldn't be a problem.

When the package gets shipped to me here in Canada, how much do I pay for customs/duties. Is there something I can refer to, depending on the price (with or without shipping) that tells me how much I will have to pay. Apparently the seller only charges sales tax if selling in California, would I have to pay tax if I'm getting them shipped here? (That question, I may have to ask the seller).

If I get the package shipped to Detroit, I will go there and get it. When I cross the border, how do I calculate how much duties I pay and if I pay tax and how much. I will be in the states for less than 24 hours.
<bot>: 1. If I get wheels and tires shipped to Toronto, Canada from California, how do I calculate duties and sales tax (if any)?