There are all kinds of articles all over the internet with information about training, such as riding with buddies, fueling, drinking, etc., but what I find the most helpful is a simple mileage chart. Bicycling Mag used to have a good one of their site but I couldn't find it. I did find this one posted by Chico Velo, a bike club in California that puts on a series of great centuries rides (they bring in a professional caterer - ever had jumbo shrimp at the end of your rides?). Any
way, they sponsor a century training series and posted a mileage chart. Using your current training base and your goal (100K per day, 100m per day, multi-day event, etc), you can kind of plug yourself into the chart and determine where you need to be. You also need to look at the century you are doing. If it is all flat, you need to train your butt to sit on the saddle and spin for hours. If it is hilly or mountainous, you need to train your climbing muscles. Check out the clubs in your area of Ootah and participate. Great way to train and glean info. Also, look at the Red Riding Hood Century for women only out of Hyrum -- maybe I'll see you there.

Chico Velo Century training schedule