First off welcome to the sport and to bikeforums.net.
Like Eric said, don't worry about workouts yet. Just get used to riding and put time on the saddle. Once you get some time in you will start learning what you need / want to work on. For the time being just concentrate on getting to where you can spend a couple of hours riding without any discomfort.
As for a typical normal ride, I really don't like to go out for less than 30 miles. My typical evening ride is in the 30 -40 mile range with an occasion 25 or 50 mile ride thrown in. My weekend rides are usually in the 50 - 60 mile range with longer rides thrown in from time to time.
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I may be fat but I'm slow enough to make up for it.