Here are some Calvin links. Of course there are five, as there ought to be, not four or four and a half.
Scott Clark has some great book recommendations here (these will give plenty of historical and theological context to the man and his theology).
Justin Taylor tells us about the Princeton "read through the Institutes in a year" planner here
You can also read Jim Packer's foreword to Hall & Lillback [eds] A Theological Guide to Calvin's Institutes: Essays and Analysis here
And Derek Thomas reminds us about the reading schedule here
And another fellow Welshman, Guy Davies, recently reviewed Paul Helm's Calvin: A Guide for the Perplexed here