Krune's idea was quite simple. He would have three waiters taking care of the orders, one to care about payments, and one helping him in the kitchen. He did a serious interview with the first four low-level cultivators to guarantee that they knew what to do. After confirming that their information was as stated in their applications, he hired them. They were two females and two males.
He then called Nina, who was the last one he needed to interview. He wanted to confirm her words first before allowing her to work in the kitchen with him.
Truth be told, Krune's restaurant was relatively small; there were no more than 20 tables total. That being said, he was more than confident enough to be able to cook all dishes on his own. After all, he could manipulate his Spiritual Energy and his Mind Splitting Technique to do several dishes simultaneously. If not that he read Nina's application by coincidence, he wouldn't have used anyone in the kitchen.