...but don't worry, things will become easier and clearer as you go, and if you have any problems, there will always be other Wikipedians happy to help, see Wikipedia:Requests for more information. There are some resources set forth below to help you get started. Good luck and have fun! -- The Wikipedia Welcoming Committee
If you would like to get a good overview of the project and how it works you could read through the introductory page which is found at Wikipedia:Contributing to Wikipedia. The same basic information can be seen at the Wikipedia:Tutorial. There is also Wikipedia:The Wikipedia Adventure, a 7-mission interactive guided tour which covers all the basics about editing and the expectations and norms of the Wikipedia community.
To browse help related pages see the help menu or help directory. Or you can use the search box at Help:contents (accessed at any time by clicking Help displayed on the left side of all pages). There is also a copy of a comprehensive published book, at Wikipedia: The Missing Manual.
Tip: Sign your name - At the end of your comments simply type four tildes (~), like this:
~~~~. If you are using the edit toolbar option (it usually appears above the edit screen by default), click the signature icon: or , to add the four tildes; this will automatically produce your username and the time, aiding the flow of discussion.
To understand Wikipedia, it is easiest to think of this website as having two types of pages: pages that are part of the encyclopedia itself, and pages of the community (used by contributors to help build and operate the encyclopedia).
To find your way around the encyclopedia, either enter a term into the search box at the top-right side of the screen, or go to Wikipedia's table of contents. Clicking on links like this one will take you to relevant or related pages. If you know the name of the topic you are looking for, simply type it into Wikipedia's search box and press Go.
If you would like to look around Wikipedia to see what's on it, keep in mind that many major subjects have a root article on the Portal:Contents/Overviews page and an outline on the Portal:Contents/Outlines page.