First Marathon Training Run

I did my first marathon training run today. I felt great, despite covering 20+ miles (19+ walking; 1 running) on Saturday/Sunday at Relay For Life. My training pace has been much slower lately, and, as a result, I feel much better. My knees, especially. I plan to stick to the 9:30 - 10:15 easy-run pace throughout my training. I'll get in my faster running when I do my quality and tempo workouts. These workouts don't start until the third week of training, however. Before I go, I should note that I've been experiencing mild discomfort in my right shin. Maybe it's these flat Brooks I'm running in. IT'S TIME TO BUY A NEW PAIR!