They say that if you keep a routine going for 3 weeks it becomes a habbit, so you're on your way to a much more disciplined diet and budget. I'm a terrible at being organized, but since we don't eat carbs we've been fasting with ease, making it pretty easy to both save money and also come up with meals.
There is a website - Eat This Much that can help generate a meal plan for you based on the calorie amount and diet style that you prefer.
AND, even better, there is also an app equivalent called "Supercook" where you can list all the ingredients you have around your house (down to herbs and spices) and it will generate recipes that you can make from what you have at home - reducing food waste and saving you a trip to the groceries.