Its nothing to do with your 'body type', its more to do with your body mass index and your aims as far as weight loss is concerned.
Go to one of the websites like fitday.com which will find your BMI for you and tell you how much you need to eat to lose weight. But as far as body type, we all have the same type but are just at different weights.
Best diet plan would be to eat 3 or 6 meals a day but to count every calorie. Make sure when you check fitday and it gives you a calorie estimate that you stick to it. Separate these calories out however you want during the day but stick to them or eat less then them and you will lose weight. Its as simple as that in theory.
Eat plenty of fresh fruit and vegetables (yes they do still have calories in them) drink as much plain water as you need (no calories in tap or bottled plain water) and eat complex carbs (brown rice, wholegrain pasta, multigrain bread- n/b, brown bread is not the same as multigrain bread- it needs to have grains in it) and eat plenty of lean protein: chicken, turkey, fish, eggs and low fat dairy. Make sure you count every calorie, even the odd sweet which has been offered to you from a friend/child/shop, it all makes an impact.
Exercise well and drink plenty (of water) when you exercise, eat lean protein and complex carbs when your done but don't forget to count it.
Keep a log book of everything you eat- keep it with you so when you get home you can see exactly what you ate- its amazing just how many people forget exactly what they ate to the tune of hundreds of calories, this has an effect: you wont lose any weight unless you can create a calorie deficit.