For those who are new to the Classic Doom scene, the sheer number of WADs and source ports can be overwhelming. This guide is an attempt to clarify things and provide some simple, useful information for newcomers.       PART 1: Getting DOOM   This guide assumes you have all 4 of the Classic Doom games - Doom 1 (The Ultimate DOOM), Doom 2, Final Doom: Evilution (TNT) and Final Doom: The Plutonia Experiment. You can get them legally at GOG or on Steam:   DOOM (19