Here are my tips:
-If your college has a health career center/advisor, you should talk to them about preparing to go to medical school.
-It doesn't matter what you major in but do well in all of your courses.
-Some of your teachers will have to write a letter of recommendation later so build relationships with them.
-get experience in the medical field by shadowing a doctor and volunteering. You can also work in the medical field, do a summer program or a research program.
-make sure you take the required courses to apply (most schools have the same requirements: Bio I&II, Chem I&II, Organic Chem I&II, Physics I&II all with lab and 1 year of English. Some schools have more requirements such as Calculus or extra biology courses)
-after you finish the required courses, take the MCAT
Your school's health careers department will be able to further help you. Here is a link to the list of all the allopathic schools, you can check each school for their requirements: here .
This site is also helpful.
You can find more information for osteopathic schools by clicking on
this link.
Good luck!