Use the following documentation to get started with Hyper-V.
Hyper-V Release Notes
Hyper-V Getting Started Guide
Hyper-V Update List for Windows Server 2008
Hyper-V Update List for Windows Server 2008 R2
Hyper-V: Using Live Migration with Cluster Shared Volumes in Windows Server 2008 R2
Hyper-V: Using Hyper-V and Failover Clustering