MURFREESBORO, Tenn. — Already an entrepreneur at age 16, Gary Willis has his sights set on a business career. The Murfreesboro resident and Blackman High School sophomore owns and markets custom T-shirts when not studying or taking classes.Willis and 70-plus Blackman students in the Blackman Collegiate Academy received plenty of advice and wisdom Thursday, March 17, during BCA Day at MTSU.From seniors to freshmen, BCA students take a field trip across town to .