If you decide to jog then the first thing you have to do is go to a good sports store and speak to a knowledgeable person on buying the proper shoes!!!
http://www.bing.com/videos/search?q=how+to+want+to+start+jogging+by+livestrong&qs=n&form=QBVR&pq=how+to+want+to+start+jogging+by+livestrong&sc=0-0&sp=-1&sk=#view=detail&mid=72A9912F19A950C7473372A9912F19A950C74733
A trick that helped me was I would walk 5 min then try to jog 1 min until your done with your walk. Try to increase the time you jog little by little.