What are some basic baking ingredients to have in your home?

I've realized that I really enjoying baking! I think it's so fun. Plus, my mom never buys sweets so I can make them all I want and she won't protest. My mom wants me to compile a list a ingredients for her to buy so i can bake. What are basic cooking ingredients so I can bake anything from brownies, to cakes, to muffins and so on. Such as flour, sugar, powdered sugar, chocolate. And not just for the cakes, but things such as icing and toppings. Thanks!