I suggest that you take a look at some bicycling books. There are alot out there, and bike maintenance is really pretty simple. There are certainly complicated parts, but the basic stuff is easy and essential to do. Some bike shops, including REI, offer bike maintenance classes.

You should also become very familiar with changing flats on both wheels. Do this at home so that when you get a flat out in the boonies, you'll be able to help yourself and get back to your ride.