The in-game tutorial should explain everything, but basically the controls are click on things you want to buy, things you would like to make, and the people to sell to them what they want. There is a timer on each of the machines, so you have to wait a short period of time in-between making each item. The time taken can be upgraded Each ingredient cost different amounts, and their products give different profits. More expensive ingredients typically have a higher profit Buy Cake Mix and the cake machine to make cakes People will turn up more often if you sell a variety of products
Purely my work, but the eight ingredients I found on the web. It was tough to make though, since there are so many variables.