Good for you going jogging! I'm sure you've heard the Couch to 5K pitch already, but I bring it up because it has provided a (semi-) sustainable way for me to go jogging. To be honest, I've gotten too busy to do it often enough to make real progress, but even staying at week 4 (the start of 5 minutes running), it provides a structured jog that is challenging but not so hard as to be unattainable.