New shop in the works... Tax question came up

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I have been working on a drop shipping store and after doing some research I realized I needed a state tax id and a EIN number for my LLC. I did all that. 

My question is: I live in Pennsylvania and I know I have nexus here. Do I have to charge tax for all customers, or just the customers who live in Pennsylvania? I do not plan on orders from outside of the United States.  


Any guidance is greatly appreciated.