Since you are a freshman, your coursework will likely not be “in the field.” Books are great, so are intro courses, but you really need a taste of what scientific research is like. Your university will have student jobs available. See if you can get a part-time job working in one of the labs. You may even be able to volunteer your time with a professor. Go and talk to some of the researchers during their office hours. They are usually more than glad to show students around the lab and may be able to allow you to work for them. You will get a flavor of the end product of the field research.

I worked in labs starting as a bottle washer (!) and moved up to actual lab work doing experimental procedures. It helped my career choices and identified for me what I enjoyed in research and areas I was not interested in.

Also, during the summers, you can work or volunteer for an organization that is out in the field. Often archaeological digs have non-professional assistants, ecological researchers do sample collection, etc. You can’t ever do enough talking to the pros finding out how they started, too.

Well you are required to take a year of science to graduate so take a science course with a lab and see how you like lab work.

Then maybe take an archeology course with a professor who is doing field work and participate over the summer to see how you like doing a dig in summer weather.

Take a course and dive right in!