I guess this is as good a place as any to ask this question.
Sure is. Welcome! Make sure to put the year of your bike in your signature or avatar, and often mileage, since that will frequently matter when asking questions (no so much with this one, however).
I just picked up a craigslist concourse and I am going to restore it.
Just think "Con Coor" (it is French, it is not spelled nor pronounced "con course" like in an airport)
Never has a Kawasaki before now.
You will love it
There are plugs that go into the holes in the side of the head where the valve cover fits. i suppose they are for valve adjustments? but the plugs are missing. I don't know what to call them so I can go find them online and buy them?
I am not the best person to answer, since I have not performed or seen a valve adjustment on a C14 before. But based on experience with other motorcycle valve adjustments, I believe to perform a valve adjustment (or check), one must remove the entire valve cover. It cannot be done through any holes or openings in the cover. If there are plugs missing, I would be very concerned, especially if they left what was in the head open to the environment.
You might be interested in purchasing not only a factory manual (available from your dealer) but the Angel Ride videos:
http://www.angelridevideos.com/concours.html