Setting up a GNU/Linux cluster

At where I'm training this summer, the whole servers and clusters run Windows, and some are mulling the idea of migrating some of the servers to GNU/Linux. So today I have been assigned the task of setting up a Linux cluster.
Ultimately, I've done my research and decided on setting up a master/slave cluster following the steps outlined here, versus a load-balancer or a round-robin. Mainly, due to being limited to two test machines, and it seems as an easier set up. If it works, we can extend it eventually by adding more slave nodes.
This is probably the most interesting thing to happen at work, since I started my summer training, and as I am writing this, I'm downloading CentOS. Never used it before, but thought it would be a good (best?) candidate for setting a server cluster. Here's to hoping everything works, without too much hassle.

I'll post later with the results, but that probably wont be until Monday.