You can never have too much information!
Take a look at this video and learn some important tips on nutrition and food quantities. Extract what you think can work for you and include them into your diet and healthy eating plan. Remember that you have to be comfortable with your diet, don't try to include foods that you just don't like, there is very little chance of you sticking to the plan in the long term. Once you have researched what is good for you with what you actually like to eat, you will have the basis of your eating plan.
All you then have to do is to include those food types into a daily eating plan which offers you variety, nutritional value and quantity control.