What is the impact of including/excluding sales tax in a product price in the USA market

Accounting & Taxes
1

Hello

I live in the state of Pennsylvania in US, and I want to create my Shopify store for the USA market.
As of now, I don’t have a business registered. I will import products from China into US.
I am trying to understand the impact of including vs excluding sales tax per product in my Shopify store.

Questions:

  1. If I don’t include a sales tax in a product price in the USA market, then will my Store customers still pay the sales tax based on their address location using the correct tax rate?
  2. Is sales tax charged automatically whether or not I include a sales tax in product price?
  3. Where in Shopify I could find the tax rate charged for a customer in my Store based on a local customer address location?
  4. After I register business in the state of Pennsylvania, how do I figure out whether I have nexus in my state?
  5. How do I determine if my Store has nexus in other states where customers will buy my store products?
  6. Do you know what information I should report to the IRS for sales taxes charged for my store?
  7. Is there anything information needs to be reported to the local state tax authorities?

Thank You