Running and a diet plan probably would work, but it takes a long time man. Just stick with it and you see change.
Start with the basics . Eat right , exercise , drink water . Maybe get a gym membership or home gym . My dad bought the total gym off a coworker & I've been using it to tone my arms & working on that 6 pack aha .
Make lots of healthy snacks Eat those in moderation throughout the day Have a decent sized breakfast Small oh lunch And small dinner You should not be too hungry by snacking on healthy food and eating small meals Keeps you metabolism working all day Then either walk or speed walk in the neighborhood to start getting to exercise There ya go, a good beginning
^Actually, contrary to popular belief, eating more small amounts throughout the day doesn't affect your metabolism. You need to calculate your caloric needs (google), eat at a deficit, and exercise.
Start lifting and eat clean. Bike instead of drive, do sprints. Fresh foods only. Protein w EVERY meal. Eggs, cheese, chicken, beef, bacon, nuts, fish. Eat carbs sparingly (bread, rice, past, oatmeal). Once or twice a day only, early in the day. It's a lifestyle change though. A diet is temporary.