There are a number of useful resources on the internet concerning the rudiments of debate and argument...
Logical Fallacies and the Art of Debate is intended to be a sort of practical guide to debating; it outlines the different kinds of fallacies that occur in debating and tells you how to avoid them and, in some instances, how to use them.
The Fallacy Files is more of a compendium and dictionary of common fallacies.
These particular sites have more to do with what makes a
bad debate rather than a good one, but good debating is largely dependant on avoiding the kinds of problems presented here.