The first step for a prospective nonimmigrant student is being accepted for enrollment in an established school which is SEVP certified. In general, for academic students attending a university, college, high school, private elementary school, seminary, conservatory or other academic institutions, including a language training program, an F visa is the appropriate category. For students attending vocational or other recognized nonacademic institutions, other than a language training program, an M visa is generally the appropriate category.
If you are going to the U.S. primarily for tourism, but want to take a short course of study that is recreational, and the course is less than 18 hours per week, you may be able to do so on a visitor (B) visa. If your course of study is 18 hours or more a week, you will need a student visa. When traveling to the U.S. to attend seminars, conferences or a program of study for academic credit then you will need a student visa.