Take some time to plan out your schedule for each semester between now and when you graduate. It is ok to have some gaps in the schedule, but having a rough timeline will help make sure you leave room for all of the classes you want to take and that you can graduate on time. It will also make your life easier at the end of the semester when you go to register for classes. A lot of the information about courses is available here:
Not all of it is up to date, so I would highly recommend talking to an adviser with more specific questions. I would also suggest building out your 4 year course plan to include general education requirements, minors you are interested in, and any study abroad plans to ensure that you can make your college experience as positive as possible. Once you have this built, it can help to show it to an upperclassmen as a sanity check to ensure you aren’t taking multiple extremely difficult classes at once.