According to your description, college students open homemade sushi food stalls at school. As long as you are selling it to the outside world, you need business license, personal health certificate, hygiene qualification and other certificates.

food safety is a problem that the country attaches great importance to, which is no small matter. Even if college students start a business, set up a Wechat business, open an online shop or set up a stall to sell, as long as they sell homemade food, they should theoretically abide by the relevant laws and policies of the state and need to obtain certain qualification certificates.

Of course, in many places in real life, we see people selling homemade food, such as stewed pig's trotters and marshmallows. Many of these mobile vendors are sold without qualification certificates. But there are risks. As a college student, you also need to weigh the consequences, which is the greater risk and benefit. As for the fact that you are entrusted by friends in the dormitory, they pay for food materials, and you help them cook them and give them a taste. This is not a public sale.