What I can advise you to do is become very good friends with your academic advisor as he will be your point of contact as to which classes are required for graduation. That will cover your chemistry degree. And because chemistry is a science, being a pre-med track student will be no different. You may have to to take a human anatomy class or medical terminology that would not be required for your chemistry degree but may be beneficial to take.
You will find that many pre-med track student will spend all of their time shadowing a nurse or doctor during their down time and while that is good and does expose you to the field, I cannot emphasize enough how much research experience is also extremely useful. Getting the research experience will make you stand out when it comes time to apply for med school and it will also expose you to another side of patient care. It may even expose you to the posibility of a MD/PhD degree in the future where you can be a researching clinician.
To get research experience you will want to search professors that are in the chemistry, biology, or neuroscience department and are seeking undergrate students. Some professors are willing to pay you while others will recommend that you take a course for credit that will count towards your degree. All I can say is that dont be afraid to reach out to professors. They understand who you are and what you are trying to do. We were there at some point in our lifes and the one thing we all want is to make student succeed in life.
Good luck in the upcoming school year and in college.