How do I search usenet for something without paying for it? If I can find what I am looking for then I will buy the service. What is the official usenet since there seems to be many sites for it like usenet.org usenet.com and usenet.nl?
>How do I search usenet for something without paying for it?
Usenet search engines can be used for free.
But to actually download, you need to sign up to a Usenet provider. Once you are a paying member, go to any Usenet search engine and search for anything you wish to download. You then download a .nzb file (it's pretty similar to a .torrent file) which is opened using a Usenet client.
I prefer Unzbin, http://www.unzbin.com/ but you can choose what you like.
This is a tutorial to get you started:
http://www.gizmodo.com.au/2009/08/how-to-use-the-heck-out-of-usenet/
The tutorial shows you how to use SabNZB, which IMO is a little harder to use. You can use UnzBin as an alternative.