hey,
Im 17 nearly 18

and I'm not really overweight i weigh about 87 kg and im about 6"2 but recently I have been trying to lose a few kilograms because I hate how soft my stomach has become. My stomach and hips are extremly flabby and I want them to become more solid but I don't really have any idea what I should be doing to achieve that.
I eat relatively healthy and recently I have been going down to the park this past week every morning and run about 7 laps every time. The park isn't a small one it's about 300-400 meters around but I don't feel this having any effect on my body. I still weigh exactly the same even after about 10-15km of running this week. I'm just wondering how long and how regularly should I run for to lose some weight? Also is it true that I should run only in the morning because thats when all my body has been stored overnight?
I also have a basic 20kg dumbells set which I rarely use. So if i want a harder stomach should I run more or do weights exercises? If weights, then what exercises do you suggest and for how long etc?
Thanks so much in advance you're really helping me out here.