Thanks, Dave. I have a 3.5 mile course that I mapped out, which I've been running at least twice a week, three times a week at most, and with a bit of walking and stretching to cool down afterwards, it's quite a comfortable run. My normal pace for that course is usually 11:00, sometimes 10:45, although I'm not sure how much I should trust the MapMyRun app! . What I think I'll try to do for my tempo workouts is do this course a little slower. There are several side streets too, in my neighborhood, so it will be easy to add another half mile if I feel comfortable and want the extra challenge. Over the next few days I'll try doing an interval workout, a tempo run, and maybe an easy hill workout, but what I want to do is build a routine that I can stick to, and maybe change it up a bit from time to time.
One thing's certain, I've been running just for the fitness aspect over the past few years, but I'm seriously getting a lot of enjoyment out of it. Not only that, but completing my first 5K this past week, and connecting with others here on the KC forum is really getting me inspired to keep on running!