If you have a business then a commercial page on Facebook can only help your business.
To create you need at least 25 people to like your page and then you must go to http://facebook.com/username and assign a commercial name to your page.
Simple like that. For example:

Business:
OLALA.com.au

Initial page was:

http://facebook.com/olala.com.au#LONG-STING-OF_NUMBERS

Visibility:
none

Commercial URL:

http://facebook.com/Advertising.Agency.Sydney

Visibility (user not login):
YES

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