Hi Jessica,
We have a doc here to help you with the setup of any tax rates you require for your store- https://docs.shopify.com/manual/taxes
Generally you would need to collect taxes for all the physical locations of your store- https://docs.shopify.com/manual/taxes/usa-tax-settings
It might be best to reach out to an accountant or your local Tax office just to confirm if you have any requirement for other states/ International customers :)
Thanks!
Anne