As already said, read the links in the posts. Also check this link http://blogs.technet.com/b/askcore/archive/2009/02/18/how-to-configure-multiple-instances-of-distributed-transaction-coordinator-dtc-on-a-windows-server-failover-cluster-2008.aspx

SQL FineBuild can take a bare metal Windows cluster and install a SQL cluster. It takes care of building the MSDTC clusters, so you have one MSDTC cluster per SQL node.

It will also deal with common MSDTC problems, such as creating a new CID for the local MSDTC and enabling network access for MSDTC.

If you are new to FineBuild, I advise getting a sandbox environment and doing a FineBuild Workstation install to see how the product works before starting on your cluster. It is also good to build your first cluster also using virtual machines, as you are unlikely to get the configuration you need for Production the first time you do a cluster install.

There is a lot to learn if you are going to use a SQL Cluster - plan to spend some time with a virtual cluster trying to break and repair it so that you know what to do when the inevitable problems happen in Production.