Build a website for me!!

What I am envisioning here is a website that will help people learn if the foods they are eating are A. Part of a healthy/balanced diet B. Provide basic nutritional information of the foods they have entered on the foods such as calories, sugar, carbs etc. and C. if these foods will help the person maintain loose or gain weight calculated of the personal information they've entered like sex, age, weight, etc. The way I picture it is you enter every food you've eaten for the day into a search bar like "1 cup skim milk" and the website will then display all of the info I entered above. I've already purchased a domain name for this website so I now I need help making my idea a reality. I am also open to all suggestions of how to improve upon the idea