I am currently a Navy Corpsman(medic), trained as a xray tech. I’ve been in for seven years now, and the first thing is definitely talking to a navy recruiter. But be wary, recruiters have quotas they need to fill, and have sell points, to make certain jobs sound amazing. Do your research online before going in. You’ll have to take a test, as well as do some medical screenings before they’ll ask about jobs. Tell them you want to be a corpsman, and stick to your guns. Sometimes a job won’t be open for a few months, and they’ll try to get you to agree to another. Just know, until you raise your hand snd sign that contract, you are always able to say no! Also, as a corpsman, there are tons of specialty jobs. You won’t know about what is available for your class until you are almost ready to graduate Corps School. Corps School is also located in San Antonio, Texas, and is about 3 1/2-4 months long. Hope some of this helped!
One note, make sure that no matter what the recruiter says, the contract you sign says everything. Once you sign a contract with the Navy, they only have to stick to what is in the contract. It's important to make sure the contract includes everything. This is not to say that the recruiter will necessarily be looking to trick you, it's just better safe than sorry.
I'm a Navy veteran and I can say that serving the country was one of my greatest honors. Your interest in becoming a Navy Hospital Corpsman (the official term) is one of most rewarding and respected fields in the service. Definitely reach out to a Navy recruiter for qualification details. In addition if you have solid aptitude in science and biology, you'll be a good fit. I've also included a link to the Navy website for more information about the field. Best wishes to you.