The Beer Judge Certification Program (BJCP) is the principal organization that trains and certifies beer judging and evaluation skills in the US.
In addition to managing their judging exam schedule, they also maintain and publish Style Guidelines for the 28 categories of beer, mead, and cider.
CBM enthusiastically supports members in their effort to get BJCP-certified by offering the exam annually and subsidizing the cost of the exam.
Zymurgy Magazine has published some articles about judging in the past:
Contact a BJCP-certified club member, or the VP-Education or VP-Competitions for more information.
BJCP Judges in CBM