Do I need a US sellers permit for my Canadian clothing store?

Hi all! So my clothing store is all set up about a month now. The 2 reasons why I haven’t launched yet is because.

  1. I register my sole business already but I don’t know if I need a sellers permit? I live in Canada and selling in and Canada and wanting to sell in United State as well. It is all drop ship from China so would I need a sellers permit for United States?

Should I just sell to Canada until I figure that out with the states? Cause I been postponing the launch because of that.

Chander