There can be many causes for being over-weight as each individual is different, but in general just by following a few simple rules, you can get yourself going in the right direction towards weight loss.

A few simple things for everyday life:
1. Firstly and most obviously, watch your food, cut out the junk food and try to eat a healthy balanced diet. Try portioning of meals, or counting calories and drink lots of water, water will make you feel fuller and give you less inclination to snack.
2. Always take the stairs, never take the lift/escalator, it will help you burn more calories and strengthen legs.
3.If you're taking a bus, get off a stop early and walk the final section.
4. Incorporate low intensity cardio into your daily routine, even if it's just going for a slow jog or taking a pet for a long walk in the morning and evening, low intensity cardio is the key to burning fat. As you get fitter you can increase the intensity and distance.
5. Keep busy - doing everyday chores will burn calories whilst keeping you busy.
6. Persevere - There is no easy way of losing weight, it will take time and effort, but the rewards in terms of how you feel and the health benefits are more than worth it.

Simply put, the secret to losing weight is burning more calories than you eat. It's as simple as that, more cardio will burn more calories, a controlled, balanced diet will reduce calories eaten. The result = weight loss.
Best of luck, watch what you eat and get some cardio done and the weight will be shed soon. I should also add that diet pills are not recommended.
For lots more information go to http://howtoburnfat.co.uk

Good luck !