There's plenty of walkthroughs on the net, best practises here: http://blogs.msdn.com/b/pamitt/archive/2010/11/06/sql-server-clustering-best-practices.aspx

Good FAQ: http://www.brentozar.com/archive/2012/02/introduction-sql-server-clusters/

Walkthrough: http://dbperf.wordpress.com/2010/07/10/walkthrough-cluster-setup-sql-win-2008/

Make sure you consider licencing costs and ensure your clients apps will reconnect after a fail-over.