What is the most efficient way to run the restaurant?

I’ve just started playing the game a few days ago and love it, have just reached chapter 3 and am still not very efficient at running the restaurant and I much prefer the diving side of the game as opposed to the restaurant and now I’ve unlocked the fish farm and land farm it’s importance is starting to take over the dives, along with trading staff and swapping new hires etc. what’s sort of a basic but efficient way to run the restaurant without needing what feels like a business degree!