Set a distance to yourself. Example today you want to run from your place to your favorite restaurant place. Tomorrow you do what's after restaurant be it gas station or I don't know anything and so on.
Never look at your watch, just focus on your legs, adjust your breathing and stamina and use an Ipod, it will help.
Personally, I eat apple and drink some fresh orange juice before jogging.
Btw, if you do it with friend of yours it's better. Much helpful with a company.