You should read a newsgroup for a few days to get an idea of the topics and tone before posting to it, so that your message will be better prepared and received. To see your message in the newsgroup you will have to close the newsgroup and then reopen it to get a fresh download of the group messages. Over the course of a few hours, your message will be propagated across the net to all of the other news servers carrying that newsgroup. Check back in a few hours or couple of days to see if your message has generated any replies as a thread of discussion. Sometimes people will reply to the content of your message without replying to your specific message, in which case they will often reference your message subject line in theirs.
Most people read messages based on their subject line, so choose a good, descriptive subject.
It should be specific and meaningful, not be too long, and not contain too many special characters like stars or exclamation points. If you have not used Usenet before, you can try composing some test messages and replying to them in the test groups . Other resources that might be useful are the Internet Netiquette sending guidelines, and the FAQ How to find the right place to post .