The Installation Guide (link posted previously) is your friend.
You need to check all the pre-req's (such as independent heartbeat links connected), network access and appropriate administrative privileges to both nodes, all servers must run the same operating system, service pack level, and
system architecture, only one path to external storage, etc.. etc...
You start the installation of SFW/HA (Storage Foundation and Cluster) on one of the nodes and select BOTH nodes to be installed simultaneously.
At the end of the installation, you can start the wizard to do the basic cluster config (setup cluster name, cluster id, heartbeats/private network, etc..).