How to Get support
Windows Azure Virtual Machines and Virtual Networks are currently in preview.
The only way of getting support is via public support forums. These forums are monitored by Microsoft Support Engineers and most questions are answered with in 24 hours. Once these features are generally available you will be able to leverage mainstream support option.
Here are a few forums you may find helpful.
Documentation and Best Practices
Documentation for Virtual Machines, Virtual Networks and Best Practices can be found below: