Most important - Diet
2nd Most Important - Weight-lifting/Fitness
3rd Most Important - Cardio
It would be a good idea to read the Nutrition Stickies on this forum.
First, You need to figure out the number of calories you need for maintenance of your current weight.
You can do that by figuring out your Basal Metabolic Rate (BMR), there's an online bmr calculator that does this for you at
BMR Calculator .
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Next,Once you have your BMR, multiply your BMR by the appropriate activity factor, as follows: (This is the Harris-Bennedict formula)
If you are sedentary (little or no exercise) : Calorie-Calculation = BMR x 1.2
If you are lightly active (light exercise/sports 1-3 days/week) : Calorie-Calculation = BMR x 1.375
If you are moderatetely active (moderate exercise/sports 3-5 days/week) : Calorie-Calculation = BMR x 1.55
If you are very active (hard exercise/sports 6-7 days a week) : Calorie-Calculation = BMR x 1.725
If you are extra active (very hard exercise/sports & physical job or 2x training) : Calorie-Calculation = BMR x 1.9
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Once you figure out your maintenance level, I would suggest going into a 500 calories deficit, meaning.. if your maintenance level is 2500 cals, you should try to eat around 2000 cals. That followed by the appopriate training and cardio and healthy diet, will help you steadily shed the fat.
Eat 5-6 Meals per day (smaller portions), Drinks lots of water.
The BMR and the Harris-Bennedict formula arent 100% accurate, and since every person is different you're gonna have to do some trial and error on yourself in order to figure out what works best for you, and how many calories should you eat.
There's a lot more to say.
I hope I helped, if you have any further questions feel free to ask. Also your belly is very small, don't worry too much about it, If you put the effort, you'll shed that belly fat in a fairly short period of time.