GET BROCHURES. That way, you can look back and remember what schools you were and weren’t interested in, and, more importantly, why you liked or disliked them.
Get basics from each rep about location, number of students, available majors, tuition, average GPA for acceptance, and anything else you have a particular interest in (ie do they have a music program, do they have student housing, what percentage of graduates pursue an advanced degree, what the core requirements for graduating are, and so on and so forth, whatever interests you most and is most important to you).
Hopefully, from hearing about these schools, you’ll find some common factors of what you want in a school. From there, narrow to a few schools you’re interested in knowing more about and visit those, if possible. If not, try to make contact with someone at the school who can answer questions you have about your interests.
There are a few basic things you should decide on. I found that the most basic starting points for types of schools to look at relied upon deciding whether you want to be on an insular campus or at a city school, what kind of major you think you want to study, and how much tuition you can and will be willing pay. Knowing those three pieces will help you narrow down significantly. From there, it gets more detailed.