make sure your diet is balanced in macronutrients-- protein, fat, carbohydrates.
fruit is great, in moderation. for some people, the sugar is too much, so it's sometimes best to leave it at 2 or 3 pieces / 200-300 calories per day of fruit.
start with some books, like oz garcia, perricone, bill phillips, etc. all basically the same principles, of balance, timing, quantity, quality.
good luck!!