Do Americans need a work permit for English teaching?

Do Americans need a work permit for English teaching?

I think so...

You don't need a work permit. You can set up a one-person company instead. Info about it all here.

thanks ukpolska

so continuing on Then apply for a NIP number at the tax office (takes up to 4 weeks)
You fill out a simple form to get registered as a business, in Warsaw this was in the town offices (5 min to fill out the form, 3 days to get the registration document)

Then you have to run around getting your REGON number (30 min - the office is of course at the other end of town in Warsaw)

Then with all these details you have to go to ZUS (which is at the other end of town) to sort out payments that you'll make every month.

I am waiting to pick up my nip. Where do I register for a business and REGON? ZUS is there on Walwelska?