A very, very brief guide ...

1. To see and use Google Earth you have to download it to your desk top.
http://earth.google.co.uk/

2. If you can't find your business on Google Earth - try finding it on Google maps and register yourself as the business owner:
http://maps.google.co.uk - click 'more information' - then click 'Business ower?'- you will be asked to create an account - Google will then want to verify you as the owner. You can then edit your listing.

3. To register a new business - go to google places and edit or create a business listing.
Google.co.uk/places - Google will contact you to verify you are the owner.

Said it was very brief!! - for the full guide to Google Earth - see http://earth.google.com/support/