My son is doing the same thing. Just finished his second semester after his mission. His first semester he took Introduction to Business, which was very good and the second semester, Introduction to Entrepreneurship, which was fantastic. He also met with an academic advisor before he started school and then last week met with an advisor from the business school. You can make an appointment with a general academic counselor through his BYU account online and they will help you set up a schedule for his first semester. They’re super helpful. Good luck!