This is your top priority. Find out how the seminary looks at such things as the authority of Scripture, missions, evangelism, social action, etc. Talk to the men and women who teach. Read what they've written. Know what they believe.
Location makes a big difference.
By all means visit the seminary and take good look at the setting. Ask how many find a place of service at graduation. Find out how it works. Be practical, but, just as important, find out how much financial aid is available and on what basis. Find out if the seminary provides for spiritual as well as academic growth.