Google has created a comprehensive user guide for the local business center. You can via the user guide over here.

It is broken down in seven sections:

1. Getting started
2. Adding a listing
3. Adding more than 10 listings
4. Verifying a listing
5. Your Local Business Center homepage
6. Editing or removing a listing
7. Other features

Here is the user guide's introductory video:

Forum discussion at Google Maps Help.

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