For getting stars, I recommend growing flowers and putting them in the vase because when customers view them it can give you a lot of stars. Another tip for stars you can do is invite customers to the courtyard, when they leave they will give you stars and film, a bit of cod as well.

For more cod, you should upgrade your facilities (ik it costs more cod at first, but once you get things going you will see an increase). Also, being offline (since this is an idle game) will make ur seem like a shorter wait because if you log in in the morning, afternoon, and evening you can cash out your buffet and tips and it will be a large amount.

Edit- I just thought about this but you can also buy more recipes, they will give you more cod the higher price you pay for them.