I'll throw in my 2 cents and say that the single most important thing is to adopt a dietary and fitness approach that suits you.
While empiracally, some diets and exercises regimens can be shown to be more efficient than others, they're of no use if you can't adhere to them.
Do the sort of fitness program that you enjoy - whether that is running, cycling, playing tennis, weight lifting, cardio classes or other. Do the sorts of routines you know you will enjoy, in which you can push yourself, and which you will stick to over time.
Ditto for diets - there are ratios of protein, fat and carbs that are most optimal, but if you cannot follow such successfully, they won't help you. Adopt a diet - low cal or low fat or low carb or other (so long as it provides you with all the major nutrients) - that you know you can follow, at least for a period of a couple of months to obtain the initial results you are seeking. You can tweak from there as you discover more about your own body.
Good luck. Size 5 sounds good to me!
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Si vis pacem parabellum.
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