If you have never created a SQL Cluster before, then it can be a confusing and daunting task.  Here are a couple resources to help you along...

Basic tasks:

1. Create shared LUNs and provide them to the servers in your cluster.  Make sure you can see the disks on your servers.

2. Add the Windows 2008 Failover Clustering Feature.  Setup your cluster on one node first and get it functional.

3. Run the SQL 2008 Setup to create a Failover Cluster

4. Add the Failover Clustering Feature to the other servers in the cluster and add them as nodes.

5. Run the SQL 2008 Setup to add the additional nodes in the cluster

Useful Links:

<a title="Microsoft SQL 2008 Clustering Guide" href="http://msdn.microsoft.com/en-us/library/ms179530.aspx" target="_blank">Microsoft SQL 2008 Clustering Guide</a>
<a title="MSSQLTips.com Guide to SQL Clustering" href="http://www.mssqltips.com/tip.asp?tip=1709" target="_blank">MSSQLTips.com Guide to SQL Clustering</a> - Highly recommended!