Eat fresh, natural (organic if possible) food. Generally, the only truly bad food is the processed and artificial stuff.
Meal frequency has a pretty low impact on weight for most people. What and how much you are eating each day is the crucial factor.
Exercise wise I would recommend strength training and interval training, which are both generally a lot more effective for losing fat than long low-moderate intensity cardio sessions due to their affect on resting metabolism.
Above all, keep it simple and enjoyable. No diets, just healthy lifestyle changes. Find exercise that works for you so that it doesn't feel like a painful obligation.