Start by eating small. Some oatmeal, fruit, protein (even just milk) before leaving. My pre long-run breakfast was oatmeal and protein powder. You MIGHT even want water with some gatorade mixed in at the beginning since you don't know your endurance levels. You'll have to experiment to see what your stomach will tolerate. But that is far to go in the morning before eating, you're already hungry from fasting for 8-10 hours overnight.

Soon you'll figure out your own method and what works best for you.

edit: Another thing to vary is when to eat before. I would eat 1/2 hour before a long bout of cardio. so basically eat as soon as I get up, then walk dog, change, get everything ready by then some time has gone by. Eating right before? I can can see how that would cause some people problems.