Welcome to BYC. Glad you decided to join our flock. I'm not sure where you are at and how available commercial feeds are in your area, but I would strongly suggest adding them to your chicken's diet if they are available. Tomatoes and wheat are fine for the occasional treat, but treats should make up less than 10% of a chicken's diet or its health will suffer in the long run (as well as its lay rate if it's a hen). Commercial feeds are specially formulated to meet all of a chicken's nutritional needs, and while homemade feed may initially save money, in the long run it will end up costing you money when your chicken's health suffers as a result. Please feel free to ask any questions you may have. We are here to help in any way we can. Good luck with your chicken.