Domain Controller and Active Directory

Dear All,

I would like to seek for advise on how I should go about as I am pretty new to Windows Server. Currently I have an old server running on Windows Server 2003 with AD, DC, and FS roles. Recently I have a new server running on Windows Server 2008 which I would like to transfer the roles from old to new server but I do not know what is the easier way to go about. They are two physical servers with different IP at the moment.

Thanks and regards

Alex