gmail setup expert to advise a small company

I need to consult a gmail expert about how to set up gmail for my business. Multiple email addresses, Blackberry synchronisation, etc... Please only respond if you have working experience with gmail setup for a company requiring multiple email addresses under the one domain. You will be required to recommend the best gmail architecture and provide advice to us on how best to set it all up. You will need strong working knowledge of all elements and requirements of gmail and its integration with other Google Apps. Assistance will be provided via VW chat or Skype.