Setting Sales Tax?

Hi, experiencing two issues, I want to set sales taxes for customers based on where they are shopping from, I see a lot of zones setup but will I have to specify the tax rate for every state myself?

Also on my registration form I can only select Europe as my country, even when I go to Display -> Custom Fields and select address_country I can only select Europe there as well. How can I resolve this? Thanks!

Thanks again Nicolas, but I'm sorry I'm getting confused by how to setup the taxes. To keep it simple, how can I set one flat tax rate for all orders?

Thanks, I realize now i never set a tax category for my products, is it possible to do a bulk edit for all my items?

Thanks!!! Hope I can sneak another question in here - I set 'Show taxed prices' to 'No Tax' but it seems to only apply to the Product page. Prices on Product Listing still include taxes, is there another setting I missed that controls this?

So now it seems we only need to charge a sales tax for customers within the state of California. I've set that up and so far seems to be working, however when users logout and no state information is known about them, the price with taxes is displayed, which is an issue since it could be more than what they have to pay. Is there a way to set default prices for unknown locations?

thank you once again Nicolas, response time here is unreal. Much appreciated!!

I'm a bit confused about tax rates.

In product configuration menu, you can select a tax category. But there doesn't seem to be a way to assign more than one rate per category. That being the case, how will the tax change depending on the province being shipped to?