You need a diploma to be a surgeon. The first step is to graduate from a four year university with a bachelors degree and you then need to attend medical school. Feel free to reference this link: https://www.studentdoctor.net/2018/12/20/how-to-get-into-medical-school/ on the steps to get in!
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I love your potential interest in becoming a surgeon. Surgeons are required to have a diploma which is then followed by an undergraduate bachelor's degree. This degree is usually in the field of biology or some other medical field of study. Some surgeons then go on to get a Masters degree while others go straight to Medical School. From medical school, they do a residency and usually take an exam to make them certified to practice medicine in the state of their choice.