The cvs manual and man page is already cited above at the very beginning. Another CVS tutorial can be found here:
http://www.csc.calpoly.edu/~dbutler/tutorials/winter96/cvs/
You can find more online resources via google.
Finally, if you are desperate you can try to get help directly from me via rgb at phy.duke.edu. Remember, though, that I already wrote this whole tutorial, and have lots to do. So try to spend your own time instead of mine first (unless, of course, we are working together on a project and you are reading this document to prepare for that).