Glad you asked!  You can anonymous ftp to one of the following:

    ftp://rtfm.mit.edu/pub/usenet-by-groups/
    ftp.uu.net:/usenet/news.answers

and pick up a copy of the Netiquette Guide ("Emily_Post..." see below), as
well as the other Frequently Asked Questions (FAQ) lists that are there.

Some suggested reading:
    How_to_find_the_right_place_to_post_(FAQ)
    A_Guide_to_Social_Newsgroups_and_Mailing_Lists
    A_Primer_on_How_to_Work_With_the_Usenet_Community
    Answers_to_Frequently_Asked_Questions_about_Usenet
    Emily_Postnews_Answers_Your_Questions_on_Netiquette
    Hints_on_writing_style_for_Usenet
    Rules_for_posting_to_Usenet
    Anonymous_FTP:_Frequently_Asked_Questions_(FAQ)_List
    What_is_Usenet?
    What_is_Usenet?__A_second_opinion.
    USENET_Software:_History_and_Sources

For Web access, some URLs are

    <URL:ftp://rtfm.mit.edu/pub/usenet-by-group/news.announce.newusers/>
    <URL:http://ug.cs.dal.ca:3400/newbie.html>
    <URL:http://www.cis.ohio-state.edu/hypertext/faq/usenet/FAQ-List.html>
    <URL:http://www.kuleuven.ac.be/>
    <URL:http://www.cs.ruu.nl/cgi-bin/faqwais>