Which VISA should I apply for?

Hi,

I am 17 years old and I have spanish nationality, my brother has been living in Manchester for 4 years and he works there. I am willing to travel there on Summer for 1 month and work as a waiter, however, I am not really sure about what VISA should I apply.

Thank you very much.

You need a skilled workers visa and a job offer from an employer holding a sponsoring licence before arriving in the UK. Casual work is not really possible for you. You can visit without a visa but working is not allowed for visitors.