upgradationof Domain Controller from Windows Server 2003 Standard 32 Bit Edition to Windows Server R2 Standard Edition

Hi Experts,

I want to upgrade Domain Controller from Windows Server 2003 Standard 32 Bit Edition to Windows Server R2 Standard Edition.

I have some query . pls help me out on these.

1. Task to be done before upgrading.
2. Step by step procedure to upgrade domain controller Windows Server 2003 Standard 32 Bit Edition to Windows Server R2 Standard Edition.
3. Issues that can happen during upgradation. And mitigation of issues.
4. How to verify the Upgradation from Server 2003 to Server 2008.
5. How to verify DNS functionality on new DC.
6. How to verify the functionality of DC 2008
7. How to demote Windows Server 2003 Domain Controller

Balwan Singh