Seething advice on offering e-commerce services in Portugal

I am interested in offering an e-commerce services in Portugal; however, I'm not sure where to start and what to know.

If anyone has any knowledge in this are, your help would be greatly appreciated. Some initial questions I'm seeking advice on include;
- Can a company Incorporated outside the EU offer e-commerce services in Portugal?

- Can a non-EU citizen incorporate a business in Portugal?

- Can you incorporate a business in another, Non-EU country and set up a subsidiary in Portugal or somewhere else in the EU like Ireland?

Thank you in advance for your feedback!

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