The key components would be:
Microsoft iSCSI Initiator – to be installed on host to connect to iSCSI SAN.
Microsoft Remote Installation Service – to be installed on host to allow clients to retrieve OS.
Server – hardware to have the host operating system as well as another server to run the iSCSI SAN software.
Gigabit Switch – dedicated stand-alone switch to connect host server and iSCSI SAN.