For persons preparing for servant-leadership in the church, most denominations have a candidacy process that requires contact with the denomination prior to the beginning of seminary. Since the process varies, all persons applying to a seminary should clarify the denomination’s candidacy expectations prior to beginning theological studies.
Consistent with your denominational polity, contact your local synod (Lutheran), diocese (Episcopalian), etc.
Speaking with your pastor is a good place to start in determining what processes your denomination requires for you to become a seminarian. Also, inquire from your local judicatory (diocese, conference, presbytery, etc.) to determine your denomination’s processes for becoming a seminarian.