How to travel to Portugal first time without Schengen visa for GV

How Non EU passport holder can travel to Portugal for first time when he doesn’t hold Schengen visa . Will there be any visa or entry permit issued to attend appointment for biometric.
How to receive GV resident card, after appointment.

You would need to apply for a Schengen Visa in order to make the trip. The Law Firm you hire to do the process for you, should issue you an invitation letter, on basis of which you’ll apply for a Schengen Visa under the Business Category.

The country of which you are a citizen determines if you need a Schengen visa to enter a country in the Schengen area. See the country lists at https://www.schengenvisainfo.com/who-needs-schengen-visa/