"What is Usenet? A second opinion.", by Vielmetti. http://www.faqs.org/faqs/usenet/what-is/part2
"FAQ: Advertising on Usenet: How To Do It, How Not To Do It" by Furr. http://www.faqs.org/faqs/usenet/advertising/how-to/part1
"A Primer on How to Work With the Usenet Community", by Von Rospach, Spafford, et. al.
http://www.faqs.org/faqs/usenet/primer/part1
"Rules for posting to Usenet", by Horton, Spafford & Moraes. http://www.faqs.org/faqs/usenet/posting-rules/part1
"Emily Postnews Answers Your Questions on Netiquette", by Templeton et. al. http://www.faqs.org/faqs/usenet/emily-postnews/part1
These are possibly the most important FAQs for new users,
but read the rest of them also.
These articles are at the Usenet FAQ archive: http://www.faqs.org