Hi,
you can start with this helpful tool: http://schema-creator.org/organization.php . Once you have filled the text fileds you're ready to go. You can add rich snippets wherever is necessary. You may use it for company's adress/informations for example. And then test it: http://www.google.com/webmasters/tools/richsnippets
I used them on this page (in the footer): http://www.posamarmizanon.it/servizi_posa_lucidatura_marmi_graniti.html
I also suggest you to check out this Introduction guide from google: http://support.google.com/webmasters/bin/answer.py?hl=eng&answer=99170
