Once you receive your catalog, take a look at required courses for incoming freshman. All universities require specific classes. Mark the courses that interest you in your catalog.
Work toward completing your required courses first. Electives can be added to your schedule once the requirements are in place. Concentrate on required courses so you can work on your major classes during junior and senior year.
Remember this in college. You will be in for a lot of changes during your first semester. You will find out soon enough how much reading and outside work is involved.
Take subjects that require different kinds of work. With a balance between reading, writing, and problem solving classes you won't get stuck having to do several research papers.
Most universities assign you an advisor for your first year. Make it a priority to set up an appointment and come with questions. Seek the advice of the department chair or teachers of classes you are considering taking.