The best advice I can give you is to eat less crap.
- Have a decent breakfast (bread, coffie/milk/orangejuice, piece of fruit), a decent lunch (bread, coffie/milk/orangejuice), piece of fruit, some white meat (chicken for example, but basicly anything low fat (like lowfat ham)) and a decent dinner (just watch the greasy stuff here, quite logical that potatoes and chicken are healthier than steak and chips/fries)
- Only eat fruit (or vegies) in between. No cookies, soda, chocolate, ...
- Drink lots of water (2l per day at least), at first you'll be pissing every 3 steps you take, but after a week or 2, your body will get used to it (resulting in less peeing). Water will help you burn stuff faster.
- After dinner (final meal of the day), go for a walk (or run, whatever makes you happy), this will help you burn the stuff you ate during that whole day.
And if you don't believe this works: I lost 22kg that way.
And don't be fooled by people going "omg start doing fitness and bodybuilding". That stuff only makes you fit and bulky, but would hardly change a thing to your weight if you don't watch your food.
PS: beer is one huge fattiemeister. A glass of beer has worse effects on your weight than a glass of cola for example.