Don't buy anything that comes in a box. Use meat servings the size of a deck of cards and all of the fresh vegetables and fruit you want from the produce section.
What works really well is to cut the meat up in the veggies and cook them all together in a crock pot or stir-fry them. The meat will add flavor to the bland tasting veggies.
If you're serious, don't look at it as a diet, do a "life style change" forever. Don't weigh or worry about dieting, just make that your lifestyle, get active and spend your time on the move.