Hi,
1. Yes, you'll be able to do that with options in commercial editions:
www.hikashop.com/support/documentation/i...ct-form.html#options
2. Taxes should be configured in HikaShop via the menu System>Taxes, and yes, you should turn them off in PayPal.
We have a tutorial on tax setup available here:
www.hikashop.com/support/documentation/3...axation-listing.html
3. Shipping should also be setup in HikaShop. If you want the rates to be calculated automatically by Canada Post, we indeed have a plugin for that. However, it requires that you enter all the weights/dimensions of all the products.
You can also simply create one manual shipping method per province and in the restrictions area of the options of the shipping method, you set the province of Canada of the shipping method in the "zone" option. That way the shipping method will only display for that zone. Thus, you can simply have one different price per province.