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If you want to learn Doom mapping (aka: create maps and shit), check this site and download Doom Builder, the BEST Doom mapping program out there!

http://www.doombuilder.com/index.php?p=tutorials

 

If you want to learn how to create mods using modern tools such as DECORATE, check the ZDoom Wiki!

http://zdoom.org/wiki

 

If you want to create new weapons, check these sites!

http://zdoom.org/wiki

http://zdoom.org/wiki/Tutorials

http://gunlabs.blogspot.com/2011/01/tutorials.html

 

Also here's some utilities you might find useful, all the cool kids have 'em!

SLADE: http://slade.mancubus.net/index.php?page=downloads (download 3.1.0)

ZDL: http://www.mediafire.com/?eq4zyb6k8c0o6nc